P0735 on 2011-2013 Chevrolet Silverado: Gear 5 Incorrect Ratio Causes and Fixes

What's Unique About the 2011-2013 Chevrolet SILVERADO

The 2011-2013 Silverado uses the GM 6L80 or 6L90 automatic transmission. A widely documented issue with this transmission is the failure of the torque converter clutch (TCC). When the TCC fails, it contaminates the fluid with metallic debris. This debris then clogs small passages in the valve body separator plate, leading to pressure loss and triggering gear ratio codes like P0735. This specific failure pattern is so common that GM issued multiple technical service bulletins about the torque converter and resulting debris.

Diagnostic Flowchart

Tap your situation to follow the diagnostic path that matches what you're seeing on this vehicle.

Symptoms You May Notice

• Check Engine Light is on
• Transmission slipping or failing to shift into 5th gear
• Harsh or delayed shifts between gears
• Vehicle enters 'limp mode', getting stuck in a lower gear (often 4th)
• Noticeable loss of power, especially at highway speeds
• Engine RPMs flare or spike without an increase in vehicle speed when trying to use 5th gear
• A shuddering or vibration feeling, especially between 35-55 mph, 🎬 Watch: How to identify and fix that common transmission shudder. which may indicate torque converter clutch failure
• Increased fuel consumption
• Transmission overheating warning light may illuminate
• In severe cases, the vehicle may not move in forward or reverse, as noted in TSB #PIP5100A.

Most Likely Causes

1. Failing Torque Converter 🔴 High Probability The original equipment torque converter clutch in the 6L80/6L90 transmission is a known weak point that degrades over time, shedding debris into the fluid. This is considered a classic failure mode for this transmission family. 🎬 Watch: A deep dive into the real causes of 6L80E failure.
   How to confirm: A professional can use a scan tool to monitor torque converter slip speed; excessive slip confirms failure. A visual inspection of the transmission fluid and pan for excessive metallic debris (looks like glitter) is a strong indicator. A transmission shudder felt at cruising speeds is also a key symptom.
   Typical fix: Replace the torque converter with an updated OEM or quality aftermarket unit. This must be done in conjunction with flushing the transmission cooler lines and replacing the valve body separator plate, filter, and fluid to remove all contaminants.
   Est. part cost: $200-$600
2. Blocked Valve Body Separator Plate Orifices 🔴 High Probability This is a direct consequence of the failing torque converter. Debris clogs the small fluid passages on the separator plate, causing hydraulic pressure loss to the clutch packs. This is documented in GM TSBs #PIP5100A and #PIP5100.
   How to confirm: Requires dropping the transmission pan and valve body for visual inspection of the separator plate. The check balls can also wear and embed themselves into the plate, causing pressure loss.
   Typical fix: Clean and inspect the valve body. 🎬 See how to properly disassemble and clean the valve body. Replace the separator plate with an updated, more durable version (e.g., ACDelco 24245720). It is critical to also replace the seven check balls. Some repair kits, like those from Sonnax, may require using their specific plate in conjunction with other valve body upgrades.
   Est. part cost: $25-$90
3. Low or Contaminated Transmission Fluid 🟡 Medium Probability
   How to confirm: Check the transmission fluid level and condition. The fluid should be red and clear, not brown, black, or containing visible metallic particles ('glitter'). Burnt-smelling fluid indicates overheating and clutch wear.
   Typical fix: Perform a transmission fluid and filter change using the correct fluid (ACDelco DEXRON-VI). If the fluid is heavily contaminated, it is a symptom of a larger internal problem (like a failing torque converter) that must be addressed.
   Est. part cost: $100-$200
4. Failed Shift Solenoid ⚪ Low Probability
   How to confirm: A professional scan tool can command the specific solenoid on and off to test its function. Resistance can also be checked with a multimeter. Debris from the torque converter can cause solenoids to stick.
   Typical fix: Replace the faulty solenoid. On 6L80/6L90 transmissions, the solenoids are part of the valve body assembly (TEHCM), often requiring replacement of the entire unit. This is an expensive part and should only be replaced after confirming it is the point of failure.
   Est. part cost: $300-$700 for a TEHCM/valve body assembly

Rare But Worth Checking

• Worn 4-5-6 Clutch Pack: If the transmission has high mileage or has been subjected to heavy towing, the clutches responsible for 5th gear may be worn out, causing slippage. This is often a secondary failure caused by low line pressure from a clogged valve body or failing pump. This typically requires a full transmission rebuild. The 4-5-6 clutch is located in the input housing.
• Faulty Transmission Control Module (TCM/TEHCM): While less common than mechanical failures, the TCM (which is integrated with the valve body on this transmission) can fail electronically, causing incorrect commands or readings. Fluid intrusion into the main electrical connector can also cause erratic behavior.

Diagnosis Steps

1. Check the transmission fluid level and condition. If it is low, top it off and check for leaks. If it is dark, burnt, or full of debris ('glitter'), suspect significant internal damage.
2. Use a professional scan tool to check for other transmission-related codes, especially P0741.
3. Monitor live data on the scan tool, observing the commanded gear vs. the actual gear, and check for torque converter slip RPM. Excessive slip during lock-up command points to a failing TCC.
4. Check the main transmission electrical connector for fluid intrusion, which can cause erratic behavior.
5. Drop the transmission pan and inspect for excessive metal shavings or clutch material. A small amount of fine grey material is normal, but large flakes or a thick layer of metallic sludge are not.
6. Inspect the transmission filter for clogging.
7. Remove and inspect the valve body and separator plate for blocked orifices, stuck check balls, and scoring, as described in TSB #PIP5100A.
8. If significant debris is found, the torque converter is the confirmed source and must be replaced, and the transmission cooler lines must be flushed thoroughly.

Parts You'll Likely Need

• Torque Converter (OEM #24291284 (supersedes 24268442, 24279756)) — This is often the root cause of the failure, shedding debris that clogs the valve body and causes the code. Replacing it is critical for a long-term fix.
  Trusted brands: ACDelco, Sonnax, Florida Torque Converter
  OEM price range: $400-$600
  Aftermarket price range: $250-$500
• Automatic Transmission Valve Body Separator Plate (OEM #24245720) — The original plate's orifices get clogged by debris. An updated, thicker plate is recommended for durability. Must be replaced, not cleaned.
  Trusted brands: ACDelco, TransGo, Sonnax
  OEM price range: $40-$90
  Aftermarket price range: $25-$60
• Automatic Transmission Fluid and Filter Kit — New fluid (DEXRON-VI) and a new filter are mandatory for any internal transmission service to remove contaminants.
  Trusted brands: ACDelco
  OEM price range: $120-$200
  Aftermarket price range: $80-$150

Related Codes That Often Appear With This One

• P0741 — This code means 'Torque Converter Clutch Circuit Performance or Stuck Off'. Its presence strongly suggests the torque converter is the root cause of the debris that leads to P0735. This is a very common pairing.
• P0731, P0732, P0733, P0734 — These are incorrect gear ratio codes for gears 1, 2, 3, and 4. Seeing them with P0735 points to a widespread hydraulic issue, like a clogged filter or major valve body problem affecting all gears.
• P0700 — This is a generic code indicating the TCM has requested the Check Engine Light to be turned on. It is almost always present with any specific transmission code like P0735.
• P0796 — This code indicates a pressure control solenoid 'C' performance/stuck off issue. GM TSB #PI1393B notes that a distressed 4-5-6 clutch (a common consequence of TCC failure) can cause this code to set.

Technical Service Bulletins (TSBs) & Recalls

• PIP5100A: Mentions P0735 in the context of a no-move condition caused by blocked valve body separator plate orifices, potentially from an aftermarket spin-on filter.
• PIP5100: Also connects P0735 to a no-move condition due to debris in the valve body separator plate orifices.
• PI1393B: Details the diagnosis for DTC P0741 (TCC Stuck Off) and notes that debris from a failing torque converter can damage the oil pump and cause the 4-5-6 clutch to fail, which is directly related to the P0735 fault.

Platform-Specific Known Issues

• GM Technical Service Bulletin #PIP5100A explicitly links P0735 (and other codes) on these vehicles to blockage in the valve body separator plate orifices, often caused by debris from an aftermarket spin-on filter or, more commonly, a failing torque converter.

Mechanic-Grade Diagnostic Values

• Shift Solenoid (On/Off type) Resistance — expected: 20-40 Ohms. Failure: A reading outside this range indicates a failed solenoid coil, requiring TEHCM replacement.
• PWM Solenoid (Pressure Control, TCC) Resistance — expected: 3-8 Ohms. Failure: A reading outside this range indicates a failed solenoid coil, requiring TEHCM replacement.
• PWM Solenoid (Pressure Control, TCC) Current Draw — expected: 1.5–4.0 Amps at 12V. Failure: Incorrect amperage draw signifies a faulty solenoid.
• Transmission Line Pressure at Idle (in gear) — expected: 45-80 PSI. Failure: Pressure below this range indicates a potential pump, valve body, or major leak issue.
• Internal Mode Switch (IMS) Bias Voltage — expected: 8.3-9.3 Volts. Failure: Incorrect voltage on the four signal circuits (A, B, C, P) points to a wiring or TCM issue.

Scan Tool Commands That Help

• GM GDS2 / Tech2 or equivalent professional scan tool: Service Fast Learn Adapts — This procedure is mandatory after replacing the transmission, valve body, TEHCM, or performing internal service. It allows the TCM to learn the hydraulic characteristics of the clutches to ensure proper shift quality. Failure to perform this can cause poor shifting and new DTCs.
• GM GDS2 / Tech2 or equivalent professional scan tool: Solenoid Cleaning Procedure — If a solenoid performance DTC is present, this automated function can be used to cycle all solenoids rapidly to dislodge minor debris before deciding to replace the TEHCM.
• Scan tool with DT-47825 Test Plate: Solenoid Actuation / Air Test — With the valve body on the bench, this allows a technician to command each solenoid on and off while applying shop air to the corresponding circuit. It definitively tests the electrical and mechanical function of each solenoid within the TEHCM.

Wiring & Ground Locations

• G110 — At the right rear of the engine, mounted to the back of the cylinder head.. This is a critical ground point shared by the ECM and TCM. A loose or corroded G110 ground can cause a wide range of issues, including transmission communication faults, erratic behavior, and even a no-start condition. It is often disturbed or improperly reinstalled during transmission replacement.
• Transmission Main Case Connector — On the passenger side of the transmission case, where the main vehicle harness connects to the internal TEHCM.. This large, round connector has a slide-lock mechanism. If it is not fully seated and locked, it can cause a loss of communication with the TCM, leading to multiple transmission codes and limp mode.
• TCM Ground Wires at Transmission Connector — Cavities 1 and 18 (Black/White wires) of the main transmission harness connector (X1).. These are the specific ground pins for the Transmission Control Module (TEHCM). They terminate at ground G110. A voltage drop test on these wires can quickly identify a bad ground connection causing TCM issues.

Real Owner Repair Stories

• YouTube user, video '6L80 Torque Converter Issues Explained' (2014 Chevrolet Silverado) — Shuddering in overdrive when the torque converter would lock up.
  ❌ Tried (didn't work) The owner performed a transmission fluid and filter service first, which did not resolve the shudder.
  ✅ What actually fixed it The owner replaced the torque converter. He cut the old converter open and confirmed the lock-up clutch material was failing. By catching it early, the transmission itself was saved from catastrophic debris damage.
• Reddit user in r/gmcsierra (2015 Chevrolet Silverado, failure at 80k miles) — Unspecified torque converter malfunction symptoms.
  ❌ Tried (didn't work) No other attempts mentioned; owner went straight for the likely cause.
  ✅ What actually fixed it Replaced only the torque converter. The repair cost $1600 pre-COVID. The truck was reported to be running well 35,000 miles later, confirming that a full rebuild is not always necessary if the failure is caught early.
• Reddit user comment (Vehicle with a 6L80, year not specified) — Intermittent no crank/no start, multiple communication DTCs between modules.
  ❌ Tried (didn't work) Initial diagnosis pointed towards module failure.
  ✅ What actually fixed it The owner found the G110 ground bolt on the back of the cylinder head was cross-threaded and loose after a shop had replaced the transmission. Creating a new, secure ground path for G110 resolved all electrical issues.

OEM Part Supersession History

• 24246916 (Early, 1st design separator plate) → 24245720 (Early, 2nd design separator plate) — Design improvement to address hydraulic integrity.
  Heads up: If the transmission has the original 24246916 plate, it MUST be replaced with the 24245720 plate during service. They are not directly interchangeable without other considerations; Sonnax recommends installing their clutch select valve spring kit 104740-02K when making this update.
• Various (e.g., 24241350 for 2006-2009) → 24256861 / 24256863 (Typical for 2010-2013) — Hardware and software updates, including improved solenoids and pressure manifold gaskets.
  Heads up: TEHCMs are year- and model-specific. Installing a TEHCM with the wrong Tag ID (e.g., putting a 2014+ unit in a 2012 truck) can result in a no-start, no-communication, or immediate limp-mode condition. The module must be correct for the vehicle and programmed to the VIN.

Model Year Variations Within This Range

• 2011 (potentially early production): Some early 6L80s may have been built with the first design separator plate (24246916), which was less robust. The standard replacement for the 2011-2013 range is the updated 24245720 plate.
• 2011-2013: The TEHCM used in this period (e.g., Tag ID 24256861) was an improvement over the 2006-2009 units but is not interchangeable with the 2014+ TEHCMs, which have different internal calibrations and logic.