P0776 on 2010-2015 Chevrolet Camaro: Pressure Control Solenoid 'E' Failure Causes and Fixes

What's Unique About the 2010-2015 Chevrolet Camaro

The 2010-2015 Camaro (5th generation) uses the Hydra-Matic 6L50 (V6) and 6L80 (V8) automatic transmissions. This P0776 code is a well-documented issue across the entire family of GM 6-speed transmissions used in trucks, SUVs, and performance cars. A primary point of failure is the Transmission Electro-Hydraulic Control Module (TEHCM), which integrates the TCM, valve body, and solenoids into one unit. Debris from torque converter clutch failure is a known issue that contaminates the fluid and leads to the failure of these sensitive TEHCM components, causing codes like P0776. GM TSB #PIP4831E specifically points to debris in the valve body as a cause for P0776 and related solenoid codes across multiple vehicles with these transmissions.

Symptoms You May Notice

• Harsh or erratic shifting
• Inability to shift into higher gears (stuck in 1st or 2nd)
• Loss of Reverse gear
• Check Engine Light is illuminated
• Vehicle enters 'limp mode'
• Transmission slipping between gears
• Engine revving unusually high without acceleration
• Flashing Check Engine light, indicating a misfire, can sometimes accompany the transmission failure

Most Likely Causes

1. Failed Transmission Electro-Hydraulic Control Module (TEHCM) 🔴 High Probability The TEHCM, which combines the TCM, solenoids, and pressure switches, is a known failure point in 6L-series transmissions. Internal components like pressure switch diaphragms can crack, or the solenoids themselves can fail electrically or mechanically due to heat and contamination, leading directly to P0776.
   How to confirm: A professional scan tool can command the solenoid on and off to check its response. If the solenoid doesn't respond but the wiring is intact, the TEHCM is the likely culprit. Multiple solenoid or pressure switch codes appearing at once strongly point to a TEHCM failure.
   Typical fix: Replacement of the entire TEHCM assembly. The new unit must be programmed to the vehicle's VIN. It is critical to also perform a full fluid and filter change and investigate the source of any contamination.
   Est. part cost: $400 - $900 for a new or remanufactured TEHCM assembly
2. Contaminated Transmission Fluid and Debris in Valve Body 🔴 High Probability A very common failure on the 6L80 is the torque converter clutch (TCC) shedding its lining material. This metallic debris circulates through the fluid, clogs the fine mesh screens on the solenoids and the passages within the valve body, causing pressure loss and sticking components. This is a primary cause of TEHCM failure.
   How to confirm: Drop the transmission oil pan and inspect the fluid and pan magnet. A large amount of metallic shavings or clutch material is a definitive sign. The fluid may be dark and have a burnt smell.
   Typical fix: If significant debris is found, the TEHCM and valve body must be replaced. The source of the debris (usually the torque converter) MUST be identified and replaced, and the transmission cooler lines must be flushed to prevent the new parts from failing immediately.
   Est. part cost: $600 - $1500 (TEHCM plus a new torque converter)
3. Low Transmission Fluid Level 🟡 Medium Probability
   How to confirm: Check the transmission fluid level according to the manufacturer's procedure. Low fluid can cause pressure issues, leading to slipping and codes that mimic a solenoid failure.
   Typical fix: Top off the fluid to the correct level with DEXRON-VI fluid and inspect for leaks that caused the low level.
   Est. part cost: $15 - $30 for a quart of fluid

Rare But Worth Checking

• Internal Transmission Mechanical Failure: A severe internal failure, such as a broken 3-5-R apply (waved) plate, can cause P0776. GM TSB PI0780A addresses this specific failure in similar 6-speed transmissions, noting it causes a loss of 3rd and Reverse gears. This requires a complete transmission teardown to repair.
• Damaged Wiring Harness: While less common than internal issues, wiring between the main vehicle harness and the TEHCM can become damaged, causing an open or short circuit. This should be inspected before condemning the expensive TEHCM.

Diagnosis Steps

1. Check the transmission fluid level and condition. Note any burnt smell or excessive metallic debris.
2. Use a professional OBD-II scanner to confirm P0776 and check for any other related codes, especially P0700 or other solenoid codes.
3. Drop the transmission oil pan and inspect the pan magnet for metal shavings. A silver, metallic paste indicates torque converter clutch failure, while larger chunks suggest hard part damage.
4. If significant debris is found, the source (likely the torque converter) must be identified. The valve body/TEHCM is almost certainly contaminated.
5. Inspect the wiring harness and connector at the transmission case for any visible damage, corrosion, or loose connections.
6. Using an advanced scan tool, monitor the commanded vs. actual state of PC Solenoid 2 and check for pressure anomalies. A solenoid performance test can confirm if it is stuck.
7. If wiring is good and the solenoid fails functional tests, the TEHCM is faulty and needs replacement.
8. If the TEHCM is replaced, the new unit must be programmed to the vehicle's VIN.

Parts You'll Likely Need

• Transmission Control Solenoid and Valve Body Assembly (TEHCM) (OEM #Commonly 24256939, but many revisions exist (e.g., 24275873, 24264141). Must be matched to vehicle year and VIN.) — This is the most comprehensive and common fix. Since the solenoids, pressure switches, and TCM are an integrated unit, and debris is a frequent cause, replacing the entire assembly is the standard professional repair to prevent repeat failures.
  Trusted brands: ACDelco (GM OE)
  OEM price range: $500 - $900
  Aftermarket price range: $400 - $700 (Remanufactured)
• Torque Converter — If the fluid is full of metallic debris, the torque converter clutch has likely failed and is the source of the contamination. Failing to replace it will cause a repeat failure of the new TEHCM.
  Trusted brands: ACDelco, Aftermarket performance options (e.g., Circle D, Yank)
  OEM price range: $400 - $700
  Aftermarket price range: $300 - $1000+
• Transmission Fluid and Filter Kit — This is mandatory for any repair. Fresh DEXRON-VI fluid and a new filter are essential to remove contaminants and ensure the longevity of the repair.
  Trusted brands: ACDelco
  OEM price range: $80 - $120
  Aftermarket price range: $50 - $90

Related Codes That Often Appear With This One

• P0700 — P0700 is a generic code indicating the Transmission Control Module (TCM) has requested the main engine computer (ECM) to turn on the Check Engine Light. It almost always appears alongside more specific transmission codes like P0776.
• P0777 — This code is for 'Pressure Control Solenoid E Stuck On'. It's the opposite of P0776 and indicates the same solenoid is stuck in the other direction, pointing to a failure of the same component.

Technical Service Bulletins (TSBs) & Recalls

• TSB #PIP4831E: Advises technicians to look for debris in the valve body for a range of solenoid codes including P0776.
• TSB #PI0780A: Details a fix for P0776 related to a broken 3-5-R apply (waved) plate in similar GM 6-speed transmissions, causing no reverse or 3rd gear.
• TSB #22-NA-258: Discusses a torn screen on the valve body spacer plate causing valves to stick and trigger P0776, particularly after cold weather events.

Platform-Specific Known Issues

• Owner Experience with P0776 on Camaro5 Forum: A user on Camaro5.com reported getting codes P0700 and P0776 after installing a new engine. Symptoms included the transmission getting stuck in 3rd gear and a complete loss of reverse, as if the car was in neutral. This real-world example perfectly matches the expected symptoms of a PC Solenoid 'E' stuck off, where the 3-5-R clutch pack cannot be engaged.

Mechanic-Grade Diagnostic Values

• Pressure Control Solenoid (PCS) Resistance — expected: 3.0-5.5 Ohms at 70°F (21°C).. Failure: A reading outside this range indicates a faulty solenoid coil.
• Shift Solenoid (On/Off type) Resistance — expected: 20-24 Ohms.. Failure: Readings outside this range suggest a bad shift solenoid. While not the direct cause of P0776, this helps evaluate overall TEHCM health.
• Solenoid Feed Voltage from TCM — expected: 8.3-9.3 volts.. Failure: Incorrect voltage from the TCM points to an internal TEHCM driver fault.
• Pressure Switch Resistance (un-actuated) — expected: Near Open Line (OL).. Failure: Low resistance when no pressure is applied indicates a shorted switch.
• Pressure Switch Resistance (actuated) — expected: Approximately 10 Ohms when pressed with a pencil eraser.. Failure: A reading of OL or significantly different resistance when pressure is applied indicates a failed switch membrane or circuit.

Scan Tool Commands That Help

• GM GDS2 / Tech2: Solenoid Valve State / Pressure Control Solenoid Test — This bidirectional command allows a technician to manually command PC Solenoid 'E' (Solenoid 2) on and off while monitoring its state and transmission line pressure. If the solenoid is commanded 'On' but the pressure doesn't change or the state reads 'Off', it confirms the solenoid is stuck or has failed electrically.
• GM GDS2 / Tech2: Solenoid Cleaning Process — The TEHCM automatically pulses the solenoids every 30 seconds in Park or Neutral to clear minor debris. A technician can trigger this cleaning cycle manually with the scan tool. If symptoms temporarily improve after running this procedure, it strongly suggests that debris and contaminated fluid are the root cause, rather than a hard electrical failure.

Wiring & Ground Locations

• G105 — On the left (driver's) side of the engine compartment.. A poor engine or chassis ground can cause erratic behavior in electronic modules, including the TEHCM. While not a primary cause, verifying main grounds is a crucial step in diagnosing any electronic fault code.
• Engine Block Grounds — There are multiple grounds on the engine block, including one at the back of each cylinder head and one near the water pump. One user on a Camaro forum noted a key ground on the passenger side of the block, below the head.. The TEHCM relies on a solid ground path through the engine and chassis. Corrosion or looseness at these points can introduce electrical noise and voltage drops, potentially causing solenoid driver faults.
• Transmission Main Connector (16-pin) — On the exterior of the transmission case, connecting the vehicle harness to the internal TEHCM.. This is the primary electrical interface. Pins for battery power, ground, and CAN bus communication are located here. Corrosion or damage to this connector can interrupt power or communication to the TEHCM, causing various codes including P0776.

OEM Part Supersession History

• 24256939 → Multiple revisions, including 24257213, 24259835, 24261870, 24264141, 24265259, 24267576, 24270598, 24275873, and 24276637. — GM continuously updated the TEHCM to address failures in solenoids, pressure switches, and internal circuitry. Later versions generally have improved durability and thermal tolerance.
  Heads up: It is critical to match the TEHCM to the vehicle's year and VIN. Mismatched hardware or software versions can lead to no-start conditions, limp mode, or incorrect shifting behavior. Programming with a J2534 device is required after installation.
• Valve Body Separator Plate (e.g., 24246916 for early models) → Later designs (e.g., 24245720, 24272467) with different orifice holes and check ball locations. — To improve shift quality and address hydraulic issues.
  Heads up: Installing a newer separator plate on an older valve body without also updating corresponding components (like clutch select valves) can block or open incorrect passages, leading to severe shifting problems and new trouble codes. The plate must match the valve body and TCM generation.

Model Year Variations Within This Range

• 2010 vs. 2011+: The valve body separator plate and TEHCM underwent several revisions. An early TEHCM (e.g., from a 2010 model) may not be compatible with a later transmission, and vice-versa. A forum user documented that separator plates from different year ranges have different hydraulic passage holes, and mismatching them will cause immediate shifting failures and codes.

Diagnostic Flowchart

Other Known Issues on This Vehicle

Issues unrelated to this code that are worth knowing about as an owner of this generation:

• Premature Timing Chain Wear (V6 LLT Engine) 🔴 High — Common on 2010-2011 models with the LLT V6, often appearing between 30,000-60,000 miles. Less common on the 2012+ LFX V6. (Ref: GM issued special coverage adjustments and software updates to recalibrate the oil life monitor, but no formal recall.)
• AFM/DOD Lifter Failure (V8 L99 Engine) 🔴 High — A well-known issue on automatic-equipped SS models with the L99 engine. The Active Fuel Management (AFM) lifters can collapse or fail, causing misfires, engine noise, and potential camshaft damage. (Ref: Multiple TSBs exist for diagnostics, but no recall was issued. The common fix is to replace the lifters or perform an 'AFM delete'.)
• Ignition Switch Recall 🔴 High — Affected all 2010-2014 Camaros. The driver's knee could bump the key fob, turning the ignition out of the 'run' position and disabling the engine and airbags. (Ref: GM Recall #14294 / NHTSA Recall #14V-346)
• Torque Converter Shudder / Failure (6L-Series Transmissions) 🟠 Medium — Common across many GM vehicles with the 6L80 transmission, including the Camaro. Owners report a shuddering or vibration at low speeds (around 40-50 mph). This is often a precursor to torque converter clutch failure, which contaminates the fluid and can lead to codes like P0776. (Ref: Multiple TSBs exist recommending fluid flushes with updated fluid types or torque converter replacement.)
• Key Stuck in Ignition 🟡 Low — Some owners of automatic models report being unable to remove the key from the ignition. This is often caused by a faulty shifter interlock solenoid or a related microswitch failing to detect that the car is in Park.
• Electrical and Infotainment Glitches 🟡 Low — Owners report various intermittent electrical issues, including malfunctioning climate controls, alarms, and buggy infotainment systems (especially on 2013+ models with the touchscreen).

Used vs. New Parts: Buying Guide for This Vehicle

When a used part is the smart pick: A used TEHCM/valve body assembly can be a cost-effective option if it comes from a low-mileage, verified-running donor vehicle. However, given the high failure rate of these components, the risk of receiving a part that is already failing or will fail soon is significant. It only makes sense if the price is extremely low and the buyer is willing to accept the risk.

Donor-vehicle mileage cap: roughly under 60000 miles for the part to have meaningful remaining life.

What to inspect on the donor part:

• Ask for the donor vehicle's VIN to verify its year and transmission type.
• Request photos of the transmission pan from the donor vehicle. Any significant amount of metallic debris is a major red flag.
• Ensure there is a return policy or warranty, as the part cannot be fully tested until it is installed and programmed.
• Inspect the electrical connector pins for any signs of corrosion or damage.

OEM-only on this vehicle (don't cheap out):

• Transmission Electro-Hydraulic Control Module (TEHCM): While remanufactured units from reputable sources like Sonnax are a good alternative, unverified aftermarket clones should be avoided. An ACDelco (GM OE) or a quality remanufactured unit is the safest bet.
• Valve Body Separator Plate: Always use an OEM plate that matches the exact year and model of your valve body to avoid hydraulic circuit mismatches.

Aftermarket brands forum-validated for this vehicle:

• Sonnax (For remanufactured TEHCMs and valve body upgrade kits).
• TransGo (For shift kits and valve body repair components).

Brands owners have reported issues with on this vehicle:

• Unbranded or 'white-box' TEHCMs from online marketplaces. Many forum users report these are often dead-on-arrival or fail quickly.

Real Owner Stories

Aggregated from forums and TSBs cited above. Mileages and costs reflect what owners reported in those sources.

Related OBD-II Codes

• P0700 — A general transmission control system malfunction code that often accompanies P0776 to trigger the Check Engine Light.

Frequently Asked Questions