C6 Corvette Stuck in Park: Shift Lock Causes & Fixes

You press the brake, push the button on the shifter, and the lever won't budge out of Park. On a 2005-2013 C6 Corvette with the automatic transmission, that is almost always the shift lock system doing its job with bad information, or not getting the power it needs. It is rarely a transmission problem. This guide explains how the C6 shift lock works, what usually causes it to stick, how to narrow it down in the driveway, how to get the car moving when you are stuck, and when a shifter rebuild, a used shifter or a keyless entry module is the real fix.

Quick Answer

• The C6 automatic will only leave Park when the car is running or in Accessory mode and the brake pedal is pressed. A solenoid inside the shifter holds the lever until the keyless entry module (GM calls it the remote control door lock receiver, or RCDLR) tells it to release.
• Check the easy things first. GM says the shift lock won't work with a battery under about 9 volts, and it needs a working brake signal. If your brake lights don't come on, fix that first.
• Listen for a click from the console when you press the brake with the car in Park. No click usually points to the shifter: the small park switch inside it, the solenoid, or its wiring.
• To get moving, try GM's sequence (release the button, hold the brake, press it again), then the owner-reported Accessory mode trick described below. Hooking the lock by hand through the boot is a last resort for emergencies only.
• GM service info lists two repair outcomes: replace the shifter assembly or replace the RCDLR. A shifter rebuild covers the most common failure.

Which Cars Does This Apply To?

Everything here is for C6 Corvettes with the automatic transmission, which was offered on the Base and Grand Sport. The Z06 and ZR1 were manual only, and manual cars have no shift lock solenoid. The shifter and keyless module changed part numbers over the run, so match your year before you order anything.

The keyless module part numbers vary a lot within 2005-2009, so read the label on yours. Several of these shifters and modules are discontinued at GM, which is why used and rebuilt parts are the common fix.

Symptoms

• The lever won't move out of Park even with the brake pressed firmly and the button pushed in.
• No click from the console when you press the brake with the car in Park.
• It sticks only some of the time, often after the car has sat for a while or on a cold morning.
• It comes out of Park with a battery charger connected, but not on the battery alone.
• The car stays in Accessory mode and shows SHIFT TO PARK after you have shifted into Park, because it doesn't see the lever in Park.
• The brake lights don't work, or a brake-related warning such as Service Active Handling is showing at the same time.
• The opposite problem: the lever comes out of Park without the brake. GM treats that as its own fault and says to have it fixed.

How the C6 Shift Lock Works

GM's service information describes three parts: the shift lock solenoid inside the shifter assembly, the RCDLR and the transmission control module (TCM). With the ignition on, the solenoid gets battery voltage. The RCDLR controls its ground side. A park switch inside the shifter closes when the lever is in Park. When the RCDLR gets word over the data network that the transmission is in Park and the brake is applied, it grounds the solenoid. The solenoid pulls in, which is the click you hear, and the lever is free to move. Once the lever leaves Park, the park switch opens and the solenoid drops out.

That means a stuck lever can come from any link in that chain: low voltage, a missing brake signal, a park switch that doesn't close, a weak or sticky solenoid, a wiring fault, or the RCDLR not sending the ground. On every C6, 2005 through 2013, the brake signal starts at a brake pedal position sensor mounted on a bracket on top of the brake pedal. The body control module reads it and passes a brake signal to the TCM and the engine computer, the same signal that turns on the brake lights.

Common Causes

1. Low Battery Voltage

The 2010 owner's manual says plainly that the shift lock release works at all times except with a dead or low battery, below about 9 volts. A C6 that sits a lot can drain its battery, and a weak solenoid can also fail when voltage is marginal. One CorvetteForum owner with a 2005 got his car out of Park only after connecting a strong charger, even though the battery was new. Rule this out before you take anything apart.

2. No Brake Signal

If the system never sees the brake applied, it never releases the lever. GM's diagnostic for a lever that won't move with the brake pressed starts by checking the brake input on a scan tool. If it isn't there, GM sends you to the brake light diagnosis. Quick check: have someone watch the brake lights while you press the pedal. If they don't come on, suspect the brake pedal position sensor, its wiring or its mounting. GM's service information doesn't show a separate brake light switch on the C6. The sensor does that job on every year. GM calls for calibrating the sensor with a scan tool after the sensor or the body control module is replaced.

3. Park Switch Inside the Shifter

This is the cause owners report most often. There are two small microswitches side by side in the C6 automatic shifter. One tells the shift lock that the lever is in Park. In a widely read CorvetteForum thread, CSixDude found that his solenoid was fine but that switch wasn't being pushed closed, so the solenoid never got its signal. Another member tested his switches, found resistance where there shouldn't be any, and replaced them. If the other switch fails, owners report the car not recognizing Park and staying in Accessory mode with SHIFT TO PARK showing.

4. Shift Lock Solenoid

The solenoid sits at the back of the shifter assembly under the boot and console. It can get weak or sticky with age. GM doesn't list the solenoid as a separate service part. Its repair step for a failed solenoid circuit inside the shifter is to replace the whole floor shift control. That is why a shifter rebuild or a replacement shifter is the usual fix.

5. Wiring or the Keyless Entry Module

If the solenoid has power but never gets its ground, GM's procedure has you test the control circuit between the shifter and the RCDLR. If the wiring checks out, the RCDLR is replaced. That isn't plug-and-play on a C6. Used modules are tied to the original car's VIN, and a new one needs GM setup and programming. If your keyless entry or alarm is also acting up, give the module a closer look. Otherwise, check the shifter first.

6. Torque Lock on a Hill

If you park on a slope and let the car settle onto the parking pawl before setting the parking brake, the lever can be very hard to pull out of Park even when the shift lock releases. GM calls this torque lock. You may still hear the click, and the lever feels jammed rather than locked. GM's advice is to have another vehicle push the car slightly uphill to take the load off the pawl. To prevent it, set the parking brake before you shift into Park, and shift out of Park before you release the parking brake.

How to Diagnose It

1. Check the battery. Measure the voltage, or connect a good charger or jump pack, and try again. If it now comes out of Park, test or replace the battery. If it keeps happening on a good battery, the solenoid may be weak.
2. Check the brake lights. If they don't work, diagnose the brake pedal position sensor first. A scan tool that can read the brake input and the RCDLR shift lock output makes this quicker.
3. Listen for the click. With the car on (or in Accessory mode) and in Park, press the brake. A click from the console means the solenoid is being commanded. No click points to the park switch, the solenoid, its power and ground, or the RCDLR.
4. Check for the opposite fault. Use GM's owner check: with the parking brake set, engine off and your foot off the brake, try to move the lever out of Park with normal effort. If it moves, the shift lock isn't holding and the car needs service.
5. Test the circuit. GM's procedure uses a test lamp at the shifter connector to confirm the solenoid's supply voltage and that the RCDLR grounds the control wire when the brake is pressed. Good supply plus good ground with no release means the shifter is at fault. No ground with good wiring means the RCDLR.
6. Rule out torque lock. If you heard the click and the lever feels wedged, take the load off the parking pawl as described above.

How to Get Out of Park When You Are Stuck

GM doesn't give C6 owners a shift lock override slot the way many cars have. The owner's manual sequence is the only official one:

1. Fully release the shift lever button.
2. While holding the brake pedal down, press the button again.
3. Move the lever to the gear you want. If it still won't move, GM says to call a dealer or a towing service.

Owners have reported two more things that work:

• The Accessory mode trick. CorvetteForum's how-to suggests turning the car off, waiting a few seconds and putting it in Accessory mode. Hold the brake the whole time, shift to Neutral, start the car, then select a gear. This only works if the shift lock is still functional and something else, such as the brake signal while running, was blocking it.
• A charger or jump pack. If voltage is marginal, a strong charger connected while you try can be enough. Connect it the way the owner's manual's jump-starting section describes.

Emergency only: the console can't come out while the lever is in Park, which makes it hard to reach the solenoid. One 2005 owner hooked the lock tab with a stiff wire through a small hole in the shift boot and pulled it back to free the lever. It works, but you are defeating a safety and anti-theft feature, it can damage the boot, and it leaves the real fault in place. Don't tie or shim the lock open and keep driving. Fix the cause.

Fix Options Compared

Which Fix Should You Choose?

Shifter Problems

If voltage and brake signal are good and there is no click, or the car can't tell it's in Park, the shifter assembly is the usual culprit. The C6 Automatic Shifter Assembly Rebuilding Service (2005-2013) is meant for shifters that won't shift or stay stuck in Park with the brake pressed. If you would rather swap parts and send nothing out, a C6 Used Automatic Shifter Assembly comes with the knob. Order by year, because there are three shifter versions. A rebuild fixes the shifter only. It won't fix the brake pedal position sensor or the car's wiring, so do the checks above first.

If you damage the boot reaching the lock in an emergency, replacement boots are listed, such as the C6 New Leather Emergency Brake Boot & Shift Boot.

Price at time of writing: shifter rebuild service $395, used shifter assembly $1,325, leather brake and shift boot set $188.99. The used shifter (all years) and the boot set were out of stock when we checked, so ask about availability. The rebuild service was available.

Brake Signal Problems

GM lists brake pedal position sensor 13597429 (it replaces 89047699) for every C6 year, 2005-2013. We list a C6 Used Brake & Clutch Pedal Position Sensor with that GM number. We also list a new reproduction C6 New Brake Light Switch (2005-2007). Its listing doesn't give a GM number. Compare the part number on yours before you order. The sensor mounts to a bracket at the pedal, the C6 Used Brake Pedal Stop Bracket (GM 10309446).

Price at time of writing: new brake light switch $22.99, used pedal position sensor $10, used stop bracket $15. The switch and the sensor were out of stock when we checked, so ask about availability. The bracket was in stock.

Keyless Entry Module Problems

If GM's circuit test shows the solenoid has power but the RCDLR never grounds it, and the wiring is good, the module is next. Because used C6 modules are VIN-locked, the C6 Reprogrammed Used Keyless Entry Module is supplied already programmed to your car. If you already have a used module, the C6 Keyless Entry Module Flat File Reprogramming Service programs it. Our C6 keyless entry module guide explains how that works.

Price at time of writing: reprogrammed used module $1,295, reprogramming service $795. Both were in stock for all three year ranges.

For more on how used and rebuilt parts compare, see buying used Corvette parts and C6 module replacement basics. If you're shopping for a C6, our C6 Corvette buyer's guide covers what else to check.

FAQ

Is there a manual shift lock override on a C6?
Not one GM documents for owners. The owner's manual only gives the release-and-retry sequence, and then says to call a dealer or towing service. Reaching the lock through the boot is an owner workaround for emergencies, not a fix.

Can a weak battery really keep me stuck in Park?
Yes. GM says the shift lock release needs at least about 9 volts. Try a charger or jump pack before anything else.

Do I hear anything when the shift lock releases?
Usually a click from the console when you press the brake in Park. No click with good voltage and working brake lights points to the shifter or its circuit.

Can I tow the car if it's stuck in Park?
Yes, but GM says a disabled C6 should be towed with all four wheels off the ground, so ask for a flatbed.

Is it the transmission?
Rarely. The shift lock is electrical and lives in the shifter and the keyless module. The exception is torque lock, where the parking pawl is loaded on a hill.

Sources

• General Motors, "2010 Chevrolet Corvette Owner Manual" (Shifting Out of Park, Torque Lock, Towing, Automatic Transmission Shift Lock Control System Check, DIC messages): GM: 2010 Corvette owner manual (PDF)
• GM service information, "Automatic Transmission Shift Lock Control Description and Operation," 2007 Corvette.
• GM service information, "Shift Lever Does Not Move with Brake Pedal Depressed," 2005 Corvette.
• GM service information, "Stop Lamps Malfunction," 2008 Corvette (brake pedal position sensor operation).
• GM service information, "Exterior Lighting Systems Description and Operation," 2005 Corvette (stop lamps).
• GM service information, "Brake Pedal Position Sensor Calibration," 2005 Corvette.
• CorvetteForum, "C6 Corvette: Why is My Corvette Stuck in Park?"
• CorvetteForum, "A6 won't shift out of park - root cause found," June 2017.
• CorvetteForum, "2005 C6 auto's stuck in Park, solution with pics," January 2013.
• GM part numbers 20916956 and 25913058 (automatic transmission control assembly), 25971235 (remote control door lock receiver), and 13597429 (brake pedal position sensor).
• GM brake pedal stop bracket 10309446.