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M
p0340
Moderate
Mercedes-Benz · Sedans
Camshaft Position Sensor A Circuit Bank 1
Quick Answer
Error code P0340 on your Mercedes-Benz Sedans means: Camshaft Position Sensor A Circuit Bank 1. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
W177W206W214V297A220 2024A220 4MATIC 2024AMG A35 4MATIC 2024AMG C43 4MATIC 2024AMG C63 S 2024AMG E53 4MATIC+ 2024AMG E63 S 2024AMG EQS 53 2024AMG S63 E 2024C300 2024C300 4MATIC 2024E350 4MATIC 2024E450 4MATIC 2024EQS 450+ 2024EQS 580 4MATIC 2024Maybach S580 2024S500 4MATIC 2024S580 4MATIC 2024W223
Likely Causes
  1. Failed camshaft position sensor
  2. Damaged wiring or connector to the camshaft position sensor
  3. Corroded sensor connector pins
  4. Faulty engine control module (rare)
  5. Timing chain jumped a tooth causing incorrect signal
How to Fix It
1
Inspect the camshaft position sensor connector for corrosion or damage
2
Test the camshaft position sensor resistance and signal output with a multimeter
3
Check wiring harness between the sensor and ECM for breaks or shorts
4
Verify timing chain alignment to ensure the chain has not jumped
5
Replace the camshaft position sensor if values are out of specification
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
Parts You May Need
Camshaft position sensor
Sensor connector repair kit
Wiring harness repair supplies
Related Error Codes
P0171P0174P0300P0410P0420
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