Multi-code OBD2 diagnosis
Enter all the codes your scanner showed, not just the first one. We give you the overall severity, whether you can keep driving, the order in which to check them and how they relate to each other.
Summary
- Overall severity
- Low
- Can I keep driving?
- Yes, no immediate risk
- Estimated cost
- $60 to $500
- Codes analyzed
- 1 of 1
The order below is the recommended one: first the codes that can cause the others. After each repair, clear the codes and check which ones come back.
Order of inspection
P0540 Intake Air Heater A Circuit Low
The P0540 code means the computer found an electrical fault in the control circuit of the intake air heater. It can cause hard starting when the engine is cold, along with white smoke. Check the fuse, relays and connectors before you replace the heater grid.