273D00

What code 273D00 means

Code 273D00 (Engine speed monitoring: Difference between Crankshaft and Camshaft positions) points to a mismatch between crankshaft and camshaft position. The DME (engine control unit) continuously compares the crankshaft and camshaft sensor signals. If the difference exceeds the allowed threshold, the fault is stored.

The most common cause is a stretched or slipping timing chain. The chain stretches over time, the tensioner can't take up the slack, and valve timing drifts. This is a critical fault: with significant desynchronization, the valves can contact the pistons and cause serious engine damage.

The system includes the timing chain, tensioner, guides, crankshaft and camshaft sprockets, and the position sensors. Code 273D00 falls under the engine category with critical severity.

Symptoms

• Engine: rough running, possible misfires.
• Behavior: power loss, hesitation under acceleration.
• Noise: timing chain noise (whirring, rattling, especially cold or at startup).
• Indicators: Check Engine light likely on; code 273D00 stored in the DME.

Symptoms may get worse under load and on a cold engine.

Diagnosis and repair

Step 1. Read the faults

Use ISTA or INPA to confirm code 273D00 and check for related timing faults.

Step 2. Inspect the timing chain

Check the chain, tensioner, and guides for wear, stretching, or slipping. Verify the timing marks.

Step 3. Replace components

If stretching or slipping is found, replace the timing chain, tensioners, and guides. A full diagnosis of the timing system is recommended.

Common diagnostic mistakes

• Writing off chain noise as “normal.”
• Replacing only the tensioner without checking the chain.
• Setting the timing incorrectly during assembly.

After the repair, clear the faults and run the adaptation.

Secondary problems

Ignoring code 273D00 can lead to further chain stretch, jumping several teeth, and, as a result, valve-to-piston contact. That damages the valves, pistons, and cylinder head. Severity: high, the repair needs to be done without delay.