C0737 - Understanding the Problem with Your Transmission Control Module (Common in 2015-2020 Chevrolet Silverado)

Quick Answer

C0737 means: DTC C0737 indicates a problem with your vehicle's Transmission Control Module.

Fix: Check and replace faulty components Cost: $700 - $1,200 Time: 90-180 minutes

Can I drive with C0737? Immediate attention is recommended to prevent further transmission damage.

Common Questions

What does C0737 mean and how does it affect my car?

The C0737 code indicates a problem with your vehicle's Transmission Control Module, which manages gear shifts and overall transmission performance. If this code appears, you may experience rough shifting, hesitation during acceleration, or even a complete transmission failure if left unaddressed.

What are the most common causes of C0737 and how much does it cost to fix?

Common causes include a faulty Transmission Control Module, wiring issues, or low transmission fluid. Repair costs can range from $100 for a fluid service to $1,200 for a TCM replacement, depending on the specific issue.

Can I drive my car with C0737 or should I stop immediately?

It's advisable to stop driving your vehicle if DTC C0737 is present. Continuing to drive can lead to more severe transmission damage, resulting in higher repair costs and safety risks.

How can I diagnose C0737 myself using GeekOBD APP?

To diagnose C0737 using the GeekOBD APP, connect the app to your vehicle's OBD2 port, run a full scan to retrieve diagnostic codes, and review freeze frame data to understand the conditions under which the code was triggered. Look for any additional codes that may provide more context.

What vehicles are most commonly affected by C0737?

Common vehicles affected by DTC C0737 include the 2015-2020 Chevrolet Silverado, 2016-2020 GMC Sierra, and some models of the 2017-2020 Cadillac Escalade. Always check for any recalls or technical service bulletins related to the TCM.

How can I prevent C0737 from happening again?

To prevent DTC C0737, ensure regular maintenance of your vehicle's transmission, including fluid changes every 30,000 miles and routine inspections of wiring and connectors to catch any issues early.

What is C0737?

DTC C0737 is a diagnostic trouble code that indicates an issue with the Transmission Control Module (TCM) in your vehicle. This code often arises when the TCM detects a malfunction in the internal components or circuits that manage the transmission's operation. In simpler terms, the TCM acts as the brain of your vehicle's transmission, controlling gear shifts and overall transmission performance. When it encounters issues, it can lead to poor shifting, unexpected gear changes, or even a complete failure to engage the transmission. Car owners may notice that their vehicle hesitates during acceleration or has difficulty staying in gear, which can be frustrating and potentially dangerous. Ignoring this code can lead to more significant transmission issues, resulting in costly repairs or replacements down the line. If you own a vehicle like the 2015 to 2020 Chevrolet Silverado, it's essential to address this code promptly to ensure your vehicle operates smoothly and safely.

System: C - Chassis (ABS, Steering, Suspension)

Symptoms

Common symptoms when C0737 is present:

  • The check engine light is illuminated and stays on, indicating an ongoing issue with the transmission.
  • Drivers may experience unexpected engine hesitation during acceleration, making it difficult to merge into traffic safely.
  • Fuel economy can decrease significantly, often by 10-15%, as the vehicle struggles to shift gears properly.
  • Shifting may feel rough or erratic, with noticeable delays when changing from one gear to another.
  • In severe cases, the vehicle might enter 'limp mode,' restricting speed and performance to protect the transmission from damage.

Possible Causes

Most common causes of C0737 (ordered by frequency):

  1. The most common cause of DTC C0737 is a faulty Transmission Control Module (TCM), which accounts for about 60% of occurrences. This can happen due to internal circuit failures or software issues.
  2. Wiring problems, such as damaged or corroded connectors, can lead to poor communication between the TCM and the transmission, accounting for about 25% of cases. Regular inspections can help prevent this.
  3. Fluid issues, including low transmission fluid levels or dirty fluid, can contribute to TCM malfunctions, making up about 10% of issues. Regular fluid changes are crucial.
  4. Less commonly, a malfunctioning transmission solenoid can trigger this code, affecting gear shifts and operational efficiency.
  5. In rare cases, external factors like engine problems or poor electrical grounding can cause the TCM to behave erratically.

C0737 Repair Costs

Cost Breakdown by Repair Type

TCM Replacement

Replacing the Transmission Control Module with a new unit, which often resolves the issue.

  • Total: $700 - $1,200
  • Success rate: 90%
Wiring Repair

Repairing or replacing damaged wiring or connectors that are causing communication issues.

  • Total: $150 - $300
  • Success rate: 80%
Fluid Service

Changing the transmission fluid and filter to ensure proper lubrication and operation.

  • Total: $100 - $200
  • Success rate: 75%
Money-Saving Tips for C0737
  • Start with the most common and least expensive repairs first
  • Use GeekOBD APP to confirm diagnosis before replacing expensive parts
  • Consider preventive maintenance to avoid future occurrences
  • Compare prices for OEM vs aftermarket parts based on your needs
  • Address the issue promptly to prevent more expensive secondary damage

Diagnostic Steps

Professional C0737 Diagnosis Process

Follow these systematic steps to accurately diagnose C0737. Each step builds on the previous one to ensure accurate diagnosis.

Step 1: Step 1: Perform an initial visual inspection to check for damaged wiring, loose connections, or corroded connectors

Step 1: Perform an initial visual inspection to check for damaged wiring, loose connections, or corroded connectors. This should take about 5-10 minutes.

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 2: Step 2: Use an OBD2 scanner, such as the GeekOBD APP, to retrieve all stored codes and freeze frame data

Step 2: Use an OBD2 scanner, such as the GeekOBD APP, to retrieve all stored codes and freeze frame data. This will help contextualize the fault and take about 10-15 minutes.

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 3: Step 3: Conduct component testing using a multimeter to check the TCM and related wiring for proper voltage and signals

Step 3: Conduct component testing using a multimeter to check the TCM and related wiring for proper voltage and signals. Expect to spend 20-30 minutes on this.

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 4: Step 4: After any repairs are made, conduct a system function test to ensure everything is operating correctly and clear the codes

Step 4: After any repairs are made, conduct a system function test to ensure everything is operating correctly and clear the codes. This takes about 10-15 minutes.

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 5: Step 5: Finally, perform a road test under various driving conditions to confirm that the repair was successful and the vehicle is functioning normally

Step 5: Finally, perform a road test under various driving conditions to confirm that the repair was successful and the vehicle is functioning normally. This will take around 15-20 minutes.

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.

Important Notes

  • Always verify the repair with GeekOBD APP after completing diagnostic steps
  • Clear codes and test drive to ensure the problem is resolved
  • Address underlying causes to prevent code recurrence

Real Repair Case Studies

Case Study 1: Transmission Control Module Replacement on 2017 Chevrolet Silverado

Vehicle: 2017 Chevrolet Silverado 1500, 65,000 miles

Problem: Customer reported rough shifting and check engine light illuminated.

Diagnosis: After scanning with the GeekOBD APP, DTC C0737 was confirmed. A visual inspection revealed signs of water damage on the TCM.

Solution: Replaced the TCM and performed a fluid service. System function tests confirmed normal operation post-repair.

Cost: $1,000 (including parts and labor)

Result: Customer reported a significant improvement in shifting and overall performance after the repair.

Case Study 2: Wiring Repair on 2018 GMC Sierra

Vehicle: 2018 GMC Sierra 1500, 50,000 miles

Problem: Customer experienced delayed shifting and engine hesitation.

Diagnosis: DTC C0737 was detected. A detailed inspection revealed corroded connectors in the wiring harness.

Solution: Repaired the damaged wiring and connectors, cleared the codes, and conducted a road test.

Cost: $250 (parts and labor)

Result: The vehicle shifted smoothly afterward, and the customer was satisfied with the repair.

Diagnose C0737

Use GeekOBD APP for professional diagnosis!

  • Real-time data monitoring
  • Advanced diagnostic features
  • Step-by-step repair guidance
  • Professional-grade analysis
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Code Information

Code: C0737
System: Chassis (ABS, Steering, Suspension)
Severity: HIGH
Category: Chassis Codes