OBD Guide
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P16B3

Engine Control Module Self-Test Torque Control Monitoring Fault

P16B3 is an OBD-II diagnostic trouble code meaning: Engine Control Module Self-Test Torque Control Monitoring Fault. Common causes: engine control module (ecm) malfunction, ecm software problems. Estimated repair cost: $167–556.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$167–556 (est.)

Symptoms

  • Check Engine light comes on
  • Reduced engine power
  • Unstable engine idling
  • Gear shifting problems (for automatic transmissions)
  • Engine speed limit

Causes

  • Engine control module (ECM) malfunction
  • ECM software problems
  • Unstable ECM supply voltage
  • Damage to the wiring harness to the ECM
  • Problems with sensors affecting torque calculations

How to Fix

  1. Check ECM supply voltage and ground
  2. Scan the ECM for other errors
  3. Update ECM software (if available)
  4. Check the integrity of the wiring harness to the ECM
  5. If necessary, replace the engine control module

Related codes

P0606P0607P16B4

FAQ

What does the P16B3 code mean?

P16B3 is an OBD-II diagnostic trouble code that indicates: Engine Control Module Self-Test Torque Control Monitoring Fault

What causes a P16B3 error code?

The most common causes of P16B3 include: Engine control module (ECM) malfunction; ECM software problems; Unstable ECM supply voltage; Damage to the wiring harness to the ECM.

How do I fix a P16B3 diagnostic trouble code?

To fix P16B3: Check ECM supply voltage and ground. Scan the ECM for other errors. Update ECM software (if available). For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P16B3?

Limited driving only, diagnose soon

How much does it cost to fix P16B3?

The estimated repair cost for P16B3 is $167–556. Actual cost depends on your vehicle, location, and labor rates.

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