P0108 meaning: MAP Circuit High Input Explained
Learn what P0108 means, common causes, DIY checks, and when to consult a specialist. Clear, factual guide for car owners.
P0108 meaning: MAP circuit high input. This code signals the engine control module detects abnormally high voltage from the manifold absolute pressure sensor circuit.
At a glance
| Severity | Can you keep driving? | DIY difficulty | Typical fix path |
|---|---|---|---|
| moderate — fix soon | short trips only | varies — confirm with a specialist | sensor cleaning or replacement |
What the code means
The powertrain control module monitors the MAP sensor's signal. When voltage exceeds expected levels during operation, it triggers P0108. This indicates a potential short to power, faulty sensor, or wiring issue in the MAP circuit.
Common causes
- Faulty MAP sensor with internal short to voltage
- Damaged wiring harness rubbing against metal components
- Corroded or loose electrical connector at the sensor
- Rarely, PCM failure requiring professional diagnosis
- Aftermarket accessories interfering with sensor signal
What shows on a live scan
During a scan tool session, monitor these PIDs:
- MAP sensor voltage reading
- Engine load percentage
- Throttle position sensor data
- Intake air temperature
- Engine coolant temperature
Values will appear abnormal when the code is active. The exact voltage threshold varies — confirm with a specialist.
DIY-safe check
Inspect the MAP sensor wiring for damage or abrasion. Clean the electrical connector with electrical contact cleaner. Ensure no aftermarket devices are mounted near the sensor. If the issue persists, P0031 meaning: HO2S Heater Control Circuit Low (Bank 1 Sensor 1) Explained · OBD2 Online can run a remote scan.
When to see a specialist
If cleaning the sensor and connector doesn't resolve the code, or if multiple related codes appear, consult a professional. a verified specialist can connect you with a verified electrician for complex diagnostics.
FAQ
What does P0108 mean?
P0108 indicates the engine control module detected abnormally high voltage in the MAP sensor circuit. It means the sensor is reading more voltage than expected during operation.
Can I keep driving with this code?
Short trips may be possible but driving with P0108 can cause poor fuel economy and reduced performance. Avoid prolonged driving until the issue is diagnosed.
How much does it cost to fix P0108?
Repair costs vary significantly based on the root cause. Simple wiring fixes cost less than sensor replacement. Cars specialists connects you with specialists for accurate estimates.
Can I fix P0108 myself?
Basic visual inspections and connector cleaning are DIY-friendly. Sensor replacement requires mechanical skill and proper tools. For most cases, a verified specialist offers the safest path to resolution.
If the check engine light persists after basic checks, P0050 meaning: HO2S Heater Control Circuit (Bank 2 Sensor 1) Explained · OBD2 Online provides related OBD code explanations to help you understand your vehicle's diagnostics better.