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2003 Dodge Ram 2WD 5.7L V8 5-Speed Auto - P0440, P0442, P0456, P2106 Fault Codes & Cold-Start Driveability Issues

Model: 2003 Dodge Ram PU 2wd 5.7 5spd auto Fault Code: P2177 Posted: 2011-03-08 23:08

Hello! I'm experiencing a driveability issue with my 2003 Dodge Ram 2WD 5.7L V8 with 5-speed automatic transmission. The problem occurs specifically in cold weather, around 0°C or below. After starting the engine and allowing it to warm up, when shifting into Drive, I notice a significant drop in power and idle stability. The vehicle seems to be firing only on four cylinders, with very poor throttle response—making it nearly impossible to drive. This issue resolves completely after turning off the engine and restarting. During this malfunctioning state, the lower right lightning bolt warning light on the dashboard illuminates. I've pulled up diagnostic trouble codes: P0440, P0442, P0456 (Evaporative Emission System-related), and P2106 (Throttle Actuator Control System Forced Limited Power Mode). I'm seeking advice from anyone who has encountered this issue or knows of a potential repair solution. Any insights into the root cause or recommended fixes would be greatly appreciated.

Related fault codes
P2177
Comments (3)
Anonymous 2011-03-09 06:03

Do you know what each diagnostic code means? Understanding the definitions can help pinpoint the actual problem.

Anonymous 2011-03-10 23:42

Codes P0440, P0442, and P0456 are related to the evaporative emission system. These typically point to issues with the purge valve or charcoal canister. The P2106 code indicates a 'Throttle Actuator Control System Forced Limited Power Mode,' which is usually triggered by either a faulty throttle actuator control motor or an issue with the accelerator pedal position (APP) sensor.

Anonymous 2011-03-11 07:53

On Dodge vehicles, evaporative emission system codes are often not caused by faulty valves—especially when leak detection DTCs are present. If your vehicle logs a leak code, it's almost certain that the purge valve and canister are functioning correctly; the real issue is likely an emissions leak that needs to be identified and repaired first. If you have P0440 or P0442 but no leak codes, focus on checking for vacuum leaks. As for the P2106 code, software updates may resolve it, and vacuum leaks can also trigger throttle motor-related faults.