Engine Mount Control Circuit High
The P0AB8 code indicates that the powertrain control module (PCM) has detected a high voltage condition in the control circuit of the active engine mount system. This system uses electronically controlled mounts to reduce engine vibration and noise. A high voltage reading suggests a short to power, a faulty mount actuator, or a wiring issue. This can lead to excessive engine movement and vibration, potentially causing drivability concerns and damage to other components.
01. Most Common Causes
- Short to power in the engine mount control circuit
- Faulty engine mount actuator
- Damaged wiring or connector
- Failed PCM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Excessive engine vibration at idle or acceleration
- Clunking noise from engine bay
- Poor drivability or rough idle
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect engine mount wiring and connectors for damage or corrosion.
Step 3: Test the engine mount actuator resistance and compare to specifications.
Step 4: Check for shorts to power or ground in the control circuit using a multimeter.
Step 5: If wiring and actuator are okay, test PCM output and replace PCM if necessary.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as excessive engine movement can damage other components like the radiator or exhaust. Short trips to a repair shop are okay.
How much does it cost to fix?▼
Repair costs typically range from $150 to $400, including parts and labor. The engine mount actuator itself costs $50-$150, plus diagnostic time.