C0736 - Understanding DTC C0736: Common in 2015-2020 Chevrolet Silverado and GMC Sierra

Quick Answer

C0736 means: DTC C0736 indicates a transmission fluid temperature sensor issue.

Fix: Check and replace faulty components Cost: $150 - $300 Time: 90-180 minutes

Can I drive with C0736? Immediate attention is recommended to prevent further transmission issues.

Common Questions

What does C0736 mean and how does it affect my car?

DTC C0736 indicates an issue with the transmission fluid temperature sensor, which can lead to erratic transmission performance, poor fuel efficiency, and potential damage if left unaddressed. The sensor helps regulate transmission temperature, crucial for smooth operation.

What are the most common causes of C0736 and how much does it cost to fix?

Typical causes include a faulty transmission fluid temperature sensor, damaged wiring, or incorrect fluid levels. Repair costs range from $100 for wiring repairs to $300 for sensor replacement, depending on the part that needs attention.

Can I drive my car with C0736 or should I stop immediately?

It is not advisable to drive with DTC C0736 as it can lead to severe transmission issues. If you experience symptoms like rough shifting or overheating, it’s best to stop driving and have your vehicle inspected immediately.

How can I diagnose C0736 myself using GeekOBD APP?

To diagnose C0736 using the GeekOBD APP, connect the app to your vehicle's OBD2 port, retrieve the trouble codes, and check for any freeze frame data. Look for patterns in symptoms and consider testing the transmission fluid temperature sensor’s readings in real-time.

What vehicles are most commonly affected by C0736?

DTC C0736 is frequently seen in models such as the 2015-2020 Chevrolet Silverado, GMC Sierra, and some Cadillac models. Regular maintenance and monitoring can help prevent this issue in affected vehicles.

How can I prevent C0736 from happening again?

To prevent DTC C0736, ensure regular transmission fluid changes, check the condition of wiring and sensors during routine maintenance, and address any warning lights promptly. Keeping an eye on fluid levels and quality can also help.

What is C0736?

DTC C0736 is a diagnostic trouble code that indicates a problem with the transmission control system, specifically related to the 'Transmission Fluid Temperature Sensor Circuit Range/Performance Problem.' This code typically arises in vehicles like the 2015-2020 Chevrolet Silverado and GMC Sierra, often pointing to issues with the transmission fluid temperature sensor or its wiring. When this code is triggered, it means that the vehicle's computer has detected that the readings from the temperature sensor are out of range or inconsistent. This can lead to various transmission issues, such as poor shifting behavior or overheating. Ignoring this code can result in further transmission damage and costly repairs. It’s essential for vehicle owners to take action when this code appears, as it can affect overall vehicle performance, fuel efficiency, and safety. Regular maintenance, including checking transmission fluid levels and ensuring sensor connections are secure, can help prevent this code from appearing. If you’re experiencing symptoms like erratic shifting or warning lights on your dashboard, it’s crucial to address the issue promptly to avoid more severe problems down the line.

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

Symptoms

Common symptoms when C0736 is present:

  • The check engine light stays on constantly, indicating a persistent issue with the transmission system.
  • Drivers may notice that the engine hesitates or shifts roughly during acceleration, leading to a jerky driving experience.
  • Fuel economy may decrease by 10-15%, as the vehicle struggles to operate efficiently due to transmission issues.
  • Unusual transmission behavior, such as slipping or failing to shift at the proper RPMs, can also occur.
  • In some cases, the vehicle may go into 'limp mode,' significantly reducing power to prevent further damage.

Possible Causes

Most common causes of C0736 (ordered by frequency):

  1. The most common cause is a faulty transmission fluid temperature sensor, with a likelihood of about 60%. This sensor may fail due to wear and tear or electrical issues.
  2. Another common cause is damaged wiring or connectors related to the sensor, which can be caused by exposure to heat or moisture.
  3. Improper transmission fluid levels or using the wrong type of transmission fluid can also trigger this code, highlighting the importance of regular maintenance.
  4. Less common but serious causes may involve internal transmission failures, such as worn components that affect sensor operation.
  5. A rare but possible cause could be a software glitch in the vehicle’s engine control unit (ECU), which may require a software update to resolve.

C0736 Repair Costs

Cost Breakdown by Repair Type

Transmission Fluid Temperature Sensor Replacement

Replacing the faulty transmission fluid temperature sensor to restore proper readings.

  • Total: $150 - $300
  • Success rate: 85%
Wiring Repair

Repairing or replacing damaged wiring or connectors associated with the sensor.

  • Total: $100 - $200
  • Success rate: 75%
Full Transmission Service

Performing a complete transmission fluid change and system check.

  • Total: $200 - $400
  • Success rate: 90%
Money-Saving Tips for C0736
  • 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 C0736 Diagnosis Process

Follow these systematic steps to accurately diagnose C0736. Each step builds on the previous one to ensure accurate diagnosis.

Step 1: Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion at the transmission temperature sensor (5-10 minutes)

Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion at the transmission temperature sensor (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: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context and any related issues (10-15 minutes)

Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context and any related issues (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: Component testing - Use a multimeter or specific diagnostic tools to test the transmission temperature sensor and associated wiring for continuity and resistance (20-30 minutes)

Step 3: Component testing - Use a multimeter or specific diagnostic tools to test the transmission temperature sensor and associated wiring for continuity and resistance (20-30 minutes).

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: System function test - Verify proper operation of the transmission and sensor after any repairs and clear codes to see if they return (10-15 minutes)

Step 4: System function test - Verify proper operation of the transmission and sensor after any repairs and clear codes to see if they return (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: Road test verification - Drive the vehicle under various conditions to confirm repair success and ensure the transmission operates smoothly (15-20 minutes)

Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success and ensure the transmission operates smoothly (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 Sensor Replacement on 2018 Chevrolet Silverado

Vehicle: 2018 Chevrolet Silverado, 45,000 miles

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

Diagnosis: After scanning for codes, C0736 was found. Visual inspection revealed a damaged sensor wire.

Solution: Replaced the transmission fluid temperature sensor and repaired the wiring.

Cost: $250 (sensor $150, labor $100)

Result: Customer reported smooth shifting and no further issues after the repair.

Case Study 2: Wiring Repair on 2016 GMC Sierra

Vehicle: 2016 GMC Sierra, 60,000 miles

Problem: Customer experienced erratic shifting and check engine light.

Diagnosis: Diagnosed with C0736; wiring harness showed signs of wear.

Solution: Repaired damaged wiring and replaced the transmission fluid.

Cost: $180 (wiring $80, fluid $100)

Result: Transmission performance restored with no subsequent codes.

Diagnose C0736

Use GeekOBD APP for professional diagnosis!

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  • Professional-grade analysis
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Code Information

Code: C0736
System: Chassis (ABS, Steering, Suspension)
Severity: HIGH
Category: Chassis Codes