P035B code meaning
Ignition E Control Signal Circuit Low
Powertrain system Generic code P03xx codes Check engine light
What P035B means
Ignition E is one of the control signal lines from the engine module to an ignition module, ignition output stage or group of coils; which cylinders it serves is defined by the manufacturer, not by the code standard. The code concerns the logic-level control signal, not the coil's primary current (that has its own codes, P0351 ff and P2300 ff). P035B means the control line reads low – typically shorted to ground. No manufacturer using these codes was found – neither GM nor Ford use the Ignition E to H codes; GM reports coil control faults as P0351 ff (open above 30 kΩ) – so the description follows CARB and that analogy. The affected coils fire wrongly or not at all, causing misfire; many modules then shut off injection to those cylinders to protect the catalyst.
P035B at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 2.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P035B
- Check engine light on
- Misfire, jerking, rough idle
- Loss of power, possibly cylinders shut off
- Additional misfire codes P0300 ff
Common causes of P035B
- Most likelyControl line shorted to ground (chafing)
- PossibleInput of the ignition module or coil shorted
- PossibleMoisture or corrosion in the connector
- Less likelyDriver stage in the engine module
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Ignition control eIgnition moduleIgnition wiring
What each part of P035B means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 3 | Area: ignition system or misfire. |
| 5B | The exact fault in that area. |
What to do next
- Note P035B and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P035B
What does P035B mean?
P035B means "Ignition E Control Signal Circuit Low". Ignition E is one of the control signal lines from the engine module to an ignition module, ignition output stage or group of coils; which cylinders it serves is defined by the manufacturer, not by the code standard. It is a generic code, so it means the same on every make.
Is it safe to drive with P035B?
Drive gently and only to a workshop. With P035B the car can go into limp mode (reduced power) to protect itself.
Will P035B fail an emissions test?
Yes, it can. P035B is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P035B to fix?
Difficulty: medium. A typical repair takes 0.5 to 2.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P035B clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.