P34AB

Code

Generic P — Powertrain

A Camshaft Position Actuator Temperature Sensor Circuit High Bank 2

Brand: Generic

Type: P — Powertrain

Views: UK: 24 EN: 35 RU: 21

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Page language: EN

Causes

Open or shorted sensor wiring (break, pinched wire, or disconnected)
Corroded or loose connector at the sensor or PCM
Failed camshaft position actuator temperature sensor (thermistor open or internal failure)
Short to battery voltage in the sensor signal or supply circuit
Poor ground or reference voltage to the sensor
Water intrusion or contamination at connector

Symptoms

Malfunction Indicator Lamp (MIL/Check Engine Light) illuminated
Reduced performance or limp-home mode in some vehicles
Rough idle or hesitation under some conditions
Incorrect cam phaser behavior or timing adaptation faults
Diagnostic trouble codes related to camshaft position or temperature sensors

What to check

Read freeze-frame and live data with a scan tool; note conditions when code set
Visual inspection of sensor, connector, and harness on Bank 2 for damage, corrosion, or fluid intrusion
Wiggle test wiring and connector while monitoring live data or checking for code re-trigger
Back-probe sensor signal, reference, and ground with key ON (engine off) to verify voltages
Measure sensor resistance at ambient and compare to expected values (service manual)
Check continuity between sensor connector and PCM pin; inspect for short to 12V or ground

Signal parameters

Reference voltage to sensor: typically ~5 V (verify with factory data)
Expected signal voltage range: approximately 0.5–4.5 V depending on temperature (varies by design)
High-voltage fault threshold: signal voltage near supply (e.g., >4.8 V) or open circuit
Typical thermistor resistance: varies (commonly in the kilo-ohm range at 25°C); consult service manual for exact ohms/temperature table
Continuity: low ohms between sensor ground and vehicle chassis ground; open/high resistance indicates wiring fault

Diagnostic algorithm

Connect a scan tool, record freeze-frame and live data, then clear the code to see if it returns.
Visually inspect the camshaft position actuator temperature sensor on Bank 2, its connector, and the wiring harness for damage, corrosion, or fluid intrusion.
With key ON (engine OFF), back-probe the sensor connector: confirm reference voltage (typically ~5 V), signal voltage, and ground presence. Note any voltage at the signal circuit indicating 'high'.
If signal is high, disconnect the sensor and measure signal wire voltage at the harness side. If voltage remains high with sensor disconnected, suspect wiring short to battery or pull-up in harness/PCM.
Measure sensor resistance at ambient and while changing temperature (warm sensor by hand or carefully with heat source) and compare to the manufacturer's resistance vs. temperature chart. An open/infinite resistance indicates a failed sensor.
Check continuity from the sensor connector to the PCM pin. Look for shorts to battery (low resistance to 12 V) or to ground.

Likely causes

Open or damaged wiring between the sensor and PCM (most common)
Corroded/loose connector at the sensor or harness
Defective camshaft position actuator temperature sensor (age/heat/failure)
Short to battery voltage on the signal lead
Intermittent connector contact due to moisture or corrosion
PCM fault (least likely)

Fault status

⚠️ Status

High-voltage / open condition detected on the Camshaft Position Actuator Temperature Sensor circuit for Bank 2. Check sensor, connector, wiring for open or short to battery; verify reference and ground; replace faulty components as needed.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours