Thursday, July 12, 2012

TRUCK SURGES WHILE RUNNING

2003 Dodge Ram Truck 4x4 surges while driving.And check engine light came ON.

Got the truck engine module scanned.

RECEIVED MULTIPLE OBD ERROR CODES

List of received error codes:---
P0633, P0837, P0839, P2121, P2122.

Its 5.9 Cummins Engine with Standard Transmission.

NOW FROM WHERE TO START THE TROUBLESHOOTING?

Its a multiple error code issue.There are few different parts in your vehicle that needs to be inspected.
First you need to know what this codes are telling and i want to know If you have replaced the ECM(engine control module) on your vehicle or not.

OK, ECM IS NOT REPLACED?

Why i asked about ECM got replaced because of error code P0633.

The error code P0633 sets when the SKIM information hasn't been properly transferred to the ECM after replacement. If  ECM replaced then  this code set because ECM is not programmed and just replaced. This code tells you to get the New ECM programmed.

But as you mentioned above that ECM is not replaced in your vehicle then the code is set erroneously or because of an aftermarket programmer being used. This code isn't related to the problem you are having.
Its nothing to worry,but other codes are.

OK,WHAT EXACTLY THESE ALL ERROR CODES MEAN?

The other codes which you noticed are real problems.
The Error code P0837 and P0839 are both for the transfer case position sensor. These could be wiring or the sensor itself.Mostly its the sensor problem.
But this both error codes are not related to your driveability problem.Yes its related to transfer case position sensor but not related to vehicle surges while driving.

And Error codes .
P2121 and 2122 are both for the accelerator pedal position sensor (APPS).
And this error codes are definitely related to drive ability issues which are noticing.

OK,WHERE IS APPS LOCATED?


The APPS (Accelerator pedal position sensor) is  mounted to the bracket under the black plastic cover at the left front corner of the cylinder head.Its exactly where the throttle cables enter. On the back of the bracket is the APPS. These sensor tells the ECM how far the throttle is open.But if the signal from this sensor is incorrect then ECM will not control the throttle and you notice such problems.
Vehicle surges, hesitates,stalling,jerks,stumbling etc.

SO SHOULD I REPLACE ACCELERATOR PEDAL POSITION SENSOR

Before replacing this sensor i suggest to inspect the wiring.
Error codes P2121 and 2122 can be caused by a wiring problem between the sensor and ECM, or the sensor itself, or problem with the ECM.
Wiring or the ECM are possible but not common at all, although failures of the APPS is majorly noticed. What I would recommend is a visual inspection of the wiring and connection, try cleaning the Sensors plug terminals then re-insert and see if its helping.But if wiring checked ok and cleaning the Accelerator pedal position sensor connectors is not helping  then replace the APPS.That will solve the problem.

This details will help.
Thanks.


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