The P0108 code means the PCM sees the voltage reading from the MAP sensor is greater than 5 Volts, or the voltage reading is higher than what the PCM considers normal.

CAUSES:

• Bad MAP sensor
• Vacuum leak
• Short on signal wire to PCM
• Short on reference voltage wire from PCM
• Open in ground circuit to MAP
• Low vacuum pressure

SYMPTOMS:

• Check engine light
• Rough idle
• Hesitating engine
• Excessive fuel consumption
• Dark exhaust smoke

DIAGNOSE AND REPAIR:

• Compare the KOEO (key on engine off) MAP sensor reading on a scan tool with the Barometric pressure reading. They should be the same because they both measure atmospheric pressure.
• Start the engine and observe the MAP reading at idle. It should normally be about 1.5 volts.
• Check all the vacuum hoses for damage and replace as necessary
• Turn the ignition off. Unplug connector at PCM and remove the MAP signal wire from the connector. Re-attach the PCM connector, check the scan tool with KOEO. Does the MAP reading show voltage? If it does, replace the PCM. If it doesnt show voltage, check for voltage on the wire you just removed from the PCM. If you find voltage on the wire, there is a short in the harness.

NOTE: This information is not intended as repair advice and we are not responsible for any actions you take on any vehicle.

The P0108 code means the PCM sees the voltage reading from the MAP sensor is greater than 5 Volts, or the voltage reading is higher than what the PCM considers normal.

CAUSES:

• Bad MAP sensor
• Vacuum leak
• Short on signal wire to PCM
• Short on reference voltage wire from PCM
• Open in ground circuit to MAP
• Low vacuum pressure

SYMPTOMS:

• Check engine light
• Rough idle
• Hesitating engine
• Excessive fuel consumption
• Dark exhaust smoke

DIAGNOSE AND REPAIR:

• Compare the KOEO (key on engine off) MAP sensor reading on a scan tool with the Barometric pressure reading. They should be the same because they both measure atmospheric pressure.
• Start the engine and observe the MAP reading at idle. It should normally be about 1.5 volts.
• Check all the vacuum hoses for damage and replace as necessary
• Turn the ignition off. Unplug connector at PCM and remove the MAP signal wire from the connector. Re-attach the PCM connector, check the scan tool with KOEO. Does the MAP reading show voltage? If it does, replace the PCM. If it doesnt show voltage, check for voltage on the wire you just removed from the PCM. If you find voltage on the wire, there is a short in the harness.

NOTE: This information is not intended as repair advice and we are not responsible for any actions you take on any vehicle.