PCM/ECM/TCM Internal Temperature Sensor Circuit Malfunction
The P06AB code indicates a problem with the internal temperature sensor circuit within the Powertrain Control Module (PCM), Engine Control Module (ECM), or Transmission Control Module (TCM). This sensor monitors the internal temperature of the module to prevent overheating. A malfunction can cause the module to incorrectly read temperature, potentially leading to performance issues or module damage. The code is set when the sensor circuit voltage is out of the expected range, often due to internal component failure, corrosion, or wiring issues.
01. Most Common Causes
- Faulty internal temperature sensor within the PCM/ECM/TCM
- Corrosion or damage to the module's internal circuitry
- Software glitch or firmware issue in the module
- Overheating of the module due to external factors
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Engine performance issues such as stalling or rough idle
- Transmission shifting problems (if TCM involved)
- Module may enter fail-safe or limp mode
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to retrieve all stored codes and freeze frame data.
Step 2: Inspect the PCM/ECM/TCM for physical damage, corrosion, or signs of overheating.
Step 3: Check for any technical service bulletins (TSBs) related to the code.
Step 4: Perform a module software update or reprogramming if available.
Step 5: If the issue persists, replace the affected module (PCM, ECM, or TCM).
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive with this code as it can lead to module failure or erratic vehicle behavior. Have it diagnosed and repaired promptly.
How much does it cost to fix?▼
The cost typically ranges from $150 to $400, including diagnostic fees and module replacement or reprogramming.