OBD Guide
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P128A

Cylinder Head Temperature Sensor Circuit Intermittent/Erratic

P128A is an OBD-II diagnostic trouble code meaning: Cylinder Head Temperature Sensor Circuit Intermittent/Erratic. Common causes: damage to sensor wiring or connectors, cylinder head temperature sensor malfunction. Estimated repair cost: $6–33.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$6–33 (est.)

Symptoms

  • Unstable engine operation
  • Increased fuel consumption
  • Check Engine Light Intermittently Turning On
  • Reduced engine power
  • Engine overheating

Causes

  • Damage to sensor wiring or connectors
  • Cylinder head temperature sensor malfunction
  • Poor contact in the sensor circuit
  • Short circuit or open circuit
  • ECU malfunction

How to Fix

  1. Check the integrity of the sensor wiring and connectors
  2. Check the resistance of the cylinder head temperature sensor
  3. Clean sensor connector contacts
  4. Replace the cylinder head temperature sensor if necessary
  5. Check the operation of the computer

Related codes

P128BP1289P1299

FAQ

What does the P128A code mean?

P128A is an OBD-II diagnostic trouble code that indicates: Cylinder Head Temperature Sensor Circuit Intermittent/Erratic

What causes a P128A error code?

The most common causes of P128A include: Damage to sensor wiring or connectors; Cylinder head temperature sensor malfunction; Poor contact in the sensor circuit; Short circuit or open circuit.

How do I fix a P128A diagnostic trouble code?

To fix P128A: Check the integrity of the sensor wiring and connectors. Check the resistance of the cylinder head temperature sensor. Clean sensor connector contacts. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P128A?

Yes, but get it checked soon

How much does it cost to fix P128A?

The estimated repair cost for P128A is $6–33. Actual cost depends on your vehicle, location, and labor rates.

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