PCM Internal A/D Processing Performance Issue
Code P060B indicates that the powertrain control module (PCM) has detected an internal performance fault in its analog-to-digital (A/D) converter circuitry. This converter is responsible for translating analog sensor signals (like throttle position, oxygen sensors, etc.) into digital data the PCM can process. When the PCM's self-diagnostics find that the A/D conversion is out of expected range or timing, it sets this code. This is a serious internal module error, often caused by a defective PCM, voltage supply issues, or internal component failure.
1. Most Common Causes
- Internal failure of the analog-to-digital (A/D) converter integrated circuit within the control module
- PCM/ECM internal reference voltage out of design specifications
- Internal hardware failure of the control module (PCM/ECM/ECU)
- Unstable power supply or ground to the control module compromising signal processing
- Severe electromagnetic interference distorting internal data processing
- Corrupted software or internal calibration of the control module (requires reprogramming)
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Engine stalling or rough running
- Reduced fuel economy
- Transmission shifting issues
3. Step-by-Step Diagnosis
Step 1: Scan for additional codes and freeze frame data to confirm P060B.
Step 2: Check battery voltage and charging system; ensure stable 12.6V+ with engine off.
Step 3: Inspect PCM connectors for corrosion, bent pins, or loose connections.
Step 4: Perform a PCM reset by disconnecting battery for 15 minutes; if code returns, PCM replacement is likely needed.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
No, it is not recommended. The PCM controls critical engine and transmission functions; a fault can cause stalling, poor performance, or even no-start conditions.
How much does it cost to fix?▼
Diagnosis typically costs $50-$150. If PCM replacement is needed, parts and labor can range from $500 to $1,500 depending on vehicle.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.