U1301 Diagnostic Trouble Code

U1301 is a kind of OBD-II Diagnostic U-Network Diagnostic Trouble Code.

It is considered generic because it applies to all makes and models of vehicles, although specific repair steps may be different depending on your car model.

Symptoms

Symptoms of a U1301 diagnostic trouble code may include:

Excessive exhaust leak
Hesitation upon acceleration
Malfunction Indicator Lamp (MIL) illuminated
The engine oil will exhibit dilution from the ECUs attempts to increase engine temperature. Some vehicles advance the fuel injection timing slightly after top center to afterburn a small amount of fuel to increase exhaust temperatures. Some of this fuel enters the crankcase. When the ECU determines the necessity to regenerate the DPF, the service life of the oil be shortened significantly

Possible Causes :

Defective ECU strategies or components will prevent proper regeneration
The Mass Airflow sensor is a hot wire that senses the volume of air entering the intake manifold. The computer uses this information to control fuel mixture.
Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.

Repair Processes :

Look for missing ground strap or a rusty ground where the fuel tank is grounded to the frame. Check for damage to the wiring harness connector. Use the DVOM to test resistance and continuity on all system circuits if actuator and sensor resistance levels are in compliance with manufacturer's specifications. Look at the plug wires to make sure they are not burnt or laying on the exhaust.

Process Tips

Diagnostic trouble code U1301 is not difficult to diagnose and repair. Thus, it always pays to have a qualified technician to look after your vehicle should this error code arise.

Diagnosing this code requires the engine to be in good running shape, without unmetered air entering the engine. If other codes that relates to misfiring condition, lean running or air entering the engine is present, then you must first fix those error codes before U1301.

Fortunately, U1301 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U1301 Trouble Code For Specific Cars

U1301 Mazda Rx-8 A Camshaft Position Actuator Circuit (Bank1)
U1301 Ford Probe Mirror Passenger Horizontal Feedback Potentiometer Circuit Short to Battery
U1301 Austin A125 Autolamp Delay Decrease Circuit Open
U1301 Gaz Chaika O2 Sensor Circuit Slow Response (Bank 2 Sensor 1)
U1301 Acura Rsx ABS Inlet Valve Coil LR Circuit Failure
U1301 Mercedes C 240 ABS Inlet Valve Coil LF Circuit Open
U1301 Mercury Villager Air Suspension RF Air Spring Solenoid Output Circuit Failure