Stretched or worn timing chain or timing belt; Faulty crankshaft position sensor or camshaft position sensor; Damaged or corroded wiring or connectors in the sensor circuits; Misaligned or improperly installed timing components; Oil sludge or debris interfering with sensor operation; Failed or failing variable valve timing (VVT) solenoid or phaser; ECM software issue or internal fault (less common)

DTC codes / P00xx · Fuel and air metering and auxiliary emission controls / P0008

P0008Engine Position System Performance (Bank 1)

Q: What does code P0008 mean?

Engine Position System Performance (Bank 1). P0008 is a generic powertrain code that indicates the engine control module (ECM) has detected a performance problem with the engine position system on bank 1, which typically involves the relationship between the crankshaft position sensor and the camshaft position sensor. The ECM monitors these signals to determine proper timing and detects when the correlation between them falls outside the expected range, often due to a mechanical timing issue or a faulty sensor.

P0008 is a generic powertrain code that indicates the engine control module (ECM) has detected a performance problem with the engine position system on bank 1, which typically involves the relationship between the crankshaft position sensor and the camshaft position sensor. The ECM monitors these signals to determine proper timing and detects when the correlation between them falls outside the expected range, often due to a mechanical timing issue or a faulty sensor.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyProfessional

AreaFuel and air metering and auxiliary emission controls

Symptoms you may notice

Illumination of the check engine light, often with no other noticeable symptoms
Rough idle or misfiring, especially when the engine is cold
Reduced engine performance or lack of power during acceleration
Difficulty starting or extended cranking time
Poor fuel economy or increased emissions
In some cases, the engine may enter limp mode or stall

Common causes, most likely first

Stretched or worn timing chain or timing belt
Faulty crankshaft position sensor or camshaft position sensor
Damaged or corroded wiring or connectors in the sensor circuits
Misaligned or improperly installed timing components
Oil sludge or debris interfering with sensor operation
Failed or failing variable valve timing (VVT) solenoid or phaser
ECM software issue or internal fault (less common)

How to diagnose and fix it

Perform a visual inspection of the timing components and sensor wiring for obvious damage or looseness
Use a scan tool to check for related codes and freeze frame data, and verify live engine position signals
Check the resistance and signal output of the crankshaft and camshaft position sensors with a multimeter or oscilloscope
Inspect the timing chain or belt for stretch or misalignment using factory timing marks
Test the VVT solenoid and phaser operation if equipped
Repair or replace faulty sensors, wiring, or timing components as needed
Clear codes and perform a road test to verify the repair, and relearn the crankshaft position sensor if required

Timing Chain Wear Often Masquerades as Sensor Fault

A stretched timing chain is a common cause of P0008 on vehicles with higher mileage, and replacing sensors alone will not fix the underlying mechanical issue.
The code can be set by a weak battery or charging system problem that causes erratic sensor signals, so always check battery voltage and connections first.
On some engines, oil sludge or low oil pressure can affect VVT operation and trigger P0008 without any sensor failure.
P0008 is often accompanied by other timing-related codes like P0016 or P0017, which can help confirm the diagnosis.
Misdiagnosis occurs when technicians replace the ECM prematurely; always verify the mechanical timing before condemning the computer.

Can I keep driving with P0008?

It is generally safe to drive short distances to a repair shop, but avoid aggressive acceleration or heavy loads. Prolonged driving with P0008 can lead to more serious engine damage if the timing chain is severely stretched.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.