Engine RPM Vehicle Speed Limiter
The powertrain control module (PCM) will disable some or all of the fuel injectors whenever an engine rpm or vehicle overspeed condition is detected.
The purpose of the engine rpm or vehicle speed limiter is to prevent damage
to the powertrain. The vehicle will exhibit a rough running engine
condition, and the PCM will store a Continuous Memory DTC P1270. Once the
driver reduces the excessive speed, the engine will return to the normal
operating mode. No repair is required. However, the technician should clear
the PCM and inform the customer of the reason for the DTC.
Excessive wheel slippage may be caused by sand, gravel, rain, mud, snow,
ice, etc. or excessive and sudden increase in rpm while in NEUTRAL or while
What is the Tech to do when he finds a DTC P1270 code?
ND1 DTC P1270: EXCESSIVE ENGINE RPM/VEHICLE SPEED
- Water, ice, mud and snow causing wheel slippage
- Excessive engine rpm in NEUTRAL
- Vehicle driven at high rate of speed
Was the vehicle operating in any of the above conditions?
OBD II system is OK. RETURN vehicle to customer with information about DTC
GO to Symptom Charts if there are other driveability concerns.
If there are no other symptoms, RETURN vehicle to customer.