Error Code P1270 is defined as Engine RPM Or Speed Limiter Reached. This means the vehicle was operated in a manner that the engine reached its calibration limit. The problem has to do with the Engine Rev Limiter system.
Unlike most codes, this code is NOT a generic trouble code that applies to all vehicles equipped with OBD-II system, or vehicles made since 1996 up to present. Rather, it is a ‘vehicle-specific’ error that usually appears in Ford, BMW, and Mazda vehicles.
Engine RPM or Vehicle Speed Limiter indicates the vehicle has been running in a manner which caused the engine or the vehicle to exceed its limit of calibration. The PCM (powertrain control module, also known as ECM or engine control module in other vehicle makes) continuously monitors the engine rpm and vehicle speed. The code is set when the rpm or speed falls out of range from the specified calibration range directed for the engine or vehicle.
Triggered Check Engine light is the most common symptom for this error code. Usually,
There are many possible causes for this code, some of the most common caused include:
- Wheel slippage (caused by mud, snow, ice or water)
- Excessive RPM of engine in neutral
- Regularly driving the vehicle at high rate of speed
How to Check and Repair
To solve this error code, you can start by replacing the linkage clips on the linkage rods for each intake manifold runner. Linkage rods work by moving each swirl chamber valve. For every engine, there are usually two linkage rods and three clips for each rod (6 total clips).
For more detailed diagnosis and repair, refer to your dealer’s manual for this code.
Note that, even after draining the cooling system, some coolants may still be left in the intake manifold. Be very careful when removing and installing the intake manifold so that no coolant will spill to the combustion chamber. Any liquid that gets into the diesel engine combustion chamber may cause a hydraulic lock on the engine, which usually results in severe damage.
This trouble code can be difficult to repair, which is why it is better to take your vehicle back to your dealer, or to a certified technician to have it fixed as soon as possible.
In some cases, the code can is fixed by clearing the code. If the problem persists without running the engine at high speed, then there’s a big chance you have another issue.