P1965 Diagnostic Trouble Code

P1965 is a kind of OBD-II Diagnostic P-Powertrain 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 P1965 diagnostic trouble code may include:

Poor fuel economy
Possible spark knock (detonation / pre-ignition)
Misfire
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.

Possible Causes :

Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.
Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.
A large vacuum leak would cause a massive amount of un-metered air to enter the intake manifold resulting in an overly lean mixture.

Repair Processes :

Look for damage to the tank indicating impact that may have damaged the fuel pump or sender. Look at the plug wires to make sure they are not burnt or laying on the exhaust. Pack the connector cavity with dielectric silicone compound (same stuff they use for light bulb sockets and spark plug wires) and reassemble.

Process Tips

Diagnostic trouble code P1965 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 P1965.

Fortunately, P1965 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P1965 Trouble Code For Specific Cars

P1965 Audi 90 Ambient Air Temperature Sensor Circuit
P1965 Moretti 850 Blend Door Failure
P1965 Monteverdi Safari Battery Power Supply ECU Circuit Short To Battery
P1965 Subaru Outback 2 LF LAMP LOW BEAM CIRCUIT Failure
P1965 Mitsubishi Lancer Evo 9 Aux A/C Blower Speed 1 Circuit Failure
P1965 Chevrolet Vega Engine Coolant Temperature (ECT) Sensor Circuit Intermittent High Voltage/IAT - B Circuit High Input
P1965 Fiat Oggi Lamp Turn Signal Rear Output Circuit Failure