BMW Cars 1999-06

3.2L L6 - Auto 2

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Trouble Code: P0325



Knock Sensor 1 Circuit Malfunction

Possible Causes:



Knock sensor circuit is open
 
Knock sensor is loose (tighten to 20 NM)
 
Contact between the knock sensor and cylinder block is dirty, corroded or greasy
 
Knock sensor circuit is shorted to ground, or shorted to power
 
Knock sensor is damaged or it has failed
 
Wrong kind of fuel used
 
A component in the engine compartment is loose or not properly secured
 

Trouble Code: P0335



Camshaft Position Sensor -A- Circ Malfunction

Possible Causes:



CMP sensor circuit is open or shorted to ground
 
CMP sensor circuit is shorted to power
 
CMP sensor ground (return) circuit is open
 
CMP sensor installation incorrect (Hall-effect type)
 
CMP sensor is damaged or CMP sensor shielding damaged
 

Trouble Code: P0340



Camshaft Position Sensor Circuit Malfunction

Possible Causes:



CMP sensor circuit is open or shorted to ground
 
CMP sensor circuit is shorted to power
 
CMP sensor ground (return) circuit is open
 
CMP sensor installation incorrect (Hall-effect type)
 
CMP sensor is damaged or CMP sensor shielding damaged
 
CMP sensor has failed
 

Trouble Code: P0412



Secondary Air Injection Solenoid Circuit Malfunction

Possible Causes:



AIR solenoid power circuit (B+) is open (check dedicated fuse)
 
AIR bypass solenoid control circuit is open or shorted to ground
 
AIR diverter solenoid control circuit open or shorted to ground
 
AIR pump control circuit is open or shorted to ground
 
Check valve (one or more) is damaged or leaking
 
Solid State relay is damaged or it has failed
 

Trouble Code: P0420



Catalyst System Efficiency (Bank 1) Below Threshold

Possible Causes:



Air leaks at the exhaust manifold or in the exhaust pipes
 
Catalytic converter is damaged, contaminated or it has failed
 
ECT/CHT sensor has lost its calibration (the signal is incorrect)
 
Engine cylinders misfiring, or the ignition timing is over retarded
 
Engine oil is contaminated
 
Front HO2S or rear HO2S is contaminated with fuel or moisture
 
Front HO2S and/or the rear HO2S is loose in the mounting hole
 
Front HO2S much older than the rear HO2S (HO2S-11 is lazy)
 
Fuel system pressure is too high (check the pressure regulator)
 
Rear HO2S wires improperly connected or the HO2S has failed
 

Trouble Code: P0430



Catalyst System Efficiency (Bank 2) Below Threshold

Possible Causes:



Air leaks at the exhaust manifold or in the exhaust pipes
 
Catalytic converter is damaged, contaminated or it has failed
 
ECT/CHT sensor has lost its calibration (the signal is incorrect)
 
Engine cylinders misfiring, or the ignition timing is over retarded
 
Engine oil is contaminated
 
Front HO2S or rear HO2S is contaminated with fuel or moisture
 
Front HO2S and/or the rear HO2S is loose in the mounting hole
 
Front HO2S much older than the rear HO2S (HO2S-11 is lazy)
 
Fuel system pressure is too high (check the pressure regulator)
 
Rear HO2S wires improperly connected or the HO2S has failed
 

Trouble Code: P0440



EVAP System Malfunction

Possible Causes:



EVAP canister purge valve is damaged
 
EVAP canister has an improper seal
 
Vapor line between purge solenoid and intake manifold vacuum reservoir is damaged, or vapor line between EVAP canister purge solenoid and charcoal canister is damaged
 
Vapor line between charcoal canister and check valve, or vapor line between check valve and fuel vapor valves is damaged
 

Trouble Code: P0441



EVAP Control System Incorrect Purge Flow

Possible Causes:



EVAP canister purge valve is damaged
 
EVAP canister has an improper seal
 
Vapor line between purge solenoid and intake manifold vacuum reservoir is damaged, or vapor line between EVAP canister purge solenoid and charcoal canister is damaged
 
Vapor line between charcoal canister and check valve, or vapor line between check valve and fuel vapor valves is damaged
 

Trouble Code: P0442



EVAP Control System Small Leak Detected

Possible Causes:



Aftermarket EVAP parts that do not conform to specifications
 
CV solenoid remains partially open when commanded to close
 
EVAP component seals leaking (i.e., leaks in the Purge valve, fuel tank pressure sensor, canister vent solenoid, fuel vapor control valve tube assembly or fuel vapor vent valve).
 
Fuel filler cap damaged, cross-threaded or loosely installed
 
Loose fuel vapor hose/tube connections to EVAP components
 
Small holes or cuts in fuel vapor hoses or EVAP canister tubes
 

Trouble Code: P0443



EVAP Vapor Management Valve Circuit Malfunction

Possible Causes:



EVAP power supply circuit is open
 
EVAP solenoid control circuit is open or shorted to ground
 
EVAP solenoid control circuit is shorted to power (B+)
 
EVAP solenoid valve is damaged or it has failed
 

Trouble Code: P0446



EVAP Control System Large Leak Detected

Possible Causes:



Aftermarket EVAP hardware non-conforming to specifications
 
EVAP canister tube, EVAP canister purge outlet tube or EVAP return tube disconnected or cracked, or canister is damaged
 
EVAP canister purge valve stuck closed, or canister damaged
 
Fuel filler cap missing, loose (not tightened) or the wrong part
 
Loose fuel vapor hose/tube connections to EVAP components
 
Canister vent (CV) solenoid stuck open
 
Fuel tank pressure (FTP) sensor has failed mechanically
 

Trouble Code: P0451



Evaporative Emission System Pressure Sensor

Possible Causes:



EVAP power supply circuit is open
 
EVAP solenoid control circuit is open or shorted to ground
 
EVAP solenoid control circuit is shorted to power (B+)
 
EVAP solenoid valve is damaged or it has failed
 
EVAP canister has a leak or a poor seal
 

Trouble Code: P0455



EVAP Control System Large Leak Detected

Possible Causes:



Aftermarket EVAP hardware non-conforming to specifications
 
EVAP canister tube, EVAP canister purge outlet tube or EVAP return tube disconnected or cracked, or canister is damaged
 
EVAP canister purge valve stuck closed, or canister damaged
 
Fuel filler cap missing, loose (not tightened) or the wrong part
 
Loose fuel vapor hose/tube connections to EVAP components
 
Canister vent (CV) solenoid stuck open
 
Fuel tank pressure (FTP) sensor has failed mechanically
 

Trouble Code: P0500



Vehicle Speed Sensor -A- Malfunction

Possible Causes:



VSS signal circuit is open or shorted to ground
 
VSS harness circuit is shorted to ground
 
VSS harness circuit is shorted to power
 
VSS circuit open between the DME and related control module
 
VSS or wheel speed sensors circuits are damaged
 
Modules connected to VSC/VSS harness circuits are damaged
 
Mechanical drive mechanism for the VSS is damaged
 

Trouble Code: P0505



Idle Air Control Valve Malfunction

Possible Causes:



Charge air system leaks
 
Recirculating valve for turbocharger is faulty
 
Turbocharging system is damaged
 
Vacuum diaphragm for turbocharger needs adjusting
 
Wastegate bypass regulator valve is faulty
 

Trouble Code: P0506



Idle Air Control System RPM Lower Than Expected

Possible Causes:



Air inlet is plugged or the air filter element is severely clogged
 
IAC circuit is open or shorted
 
IAC circuit VPWR circuit is open
 
IAC solenoid is damaged or has failed
 
The VSS has failed
 

Trouble Code: P0600



Serial Communication Link (Data BUS) Message Missing

Possible Causes:



CAN data bus wires have short circuited to each other
 

Trouble Code: P0601



Internal Control Module Memory Check Sum Error

Possible Causes:



Battery terminal corrosion, or loose battery connection
 
Connection to the DME interrupted, or the circuit has been opened
 
Reprogramming error has occurred
 
and needs replacement. Remember to check for Aftermarket Performance Products before replacing a DME.
 

Trouble Code: P0604



Internal Control Module Random Access Memory (RAM) Error

Possible Causes:



Battery terminal corrosion, or loose battery connection
 
Connection to the DME interrupted, or the circuit has been opened
 
Reprogramming error has occurred
 
and needs replacement. Remember to check for Aftermarket Performance Products before replacing a DME.
 

Trouble Code: P0705



TR Sensor Circuit Malfunction

Possible Causes:



Circuit harness connector contacts are corroded or ingresses of water
 
Circuit wires have shorted to each other, to battery or ground
 
Automatic Transmission Hydraulic Pressure Sensor 1 has failed
 
Solenoid valves in valve body are faulty
 
Transmission Input Speed (RPM) Sensor has failed
 
Transmission Output Speed (RPM) Sensor has failed
 
Engine Control Module (DME) is faulty
 
Voltage supply for Engine Control Module (DME) is faulty
 
Transmission Control Module (TCM) is faulty
 

Trouble Code: P0715



Input/Turbine Speed Sensor Circuit Malfunction

Possible Causes:



TVSS signal circuit is open
 
TVSS signal is shorted to chassis ground
 
TVSS signal is shorted to sensor ground
 
TVSS assembly is damaged or it has failed
 

Trouble Code: P0720



Output/Turbine Speed Sensor Circuit Malfunction

Possible Causes:



TVSS signal circuit is open
 
TVSS signal is shorted to chassis ground
 
TVSS signal is shorted to sensor ground
 
TVSS assembly is damaged or it has failed
 

Trouble Code: P0731



Incorrect First Gear Ratio

Possible Causes:



1st Gear solenoid harness connector not properly seated
 
1st Gear solenoid signal shorted to ground, or open
 
1st Gear solenoid wiring harness connector is damaged
 
1st Gear solenoid is damaged or not properly installed
 
ATF level is low
 
Circuit harness connector contacts are corroded or ingresses of water
 
Circuit wires have shorted to each other, to battery or ground
 
Automatic Transmission Hydraulic Pressure Sensor 1 has failed
 
Transmission Control Module (TCM) needs replacing
 
Transmission Input Speed (RPM) Sensor has failed
 
Transmission Output Speed (RPM) Sensor has failed
 

Trouble Code: P0732



Incorrect Second Gear Ratio

Possible Causes:



2nd Gear solenoid harness connector not properly seated
 
2nd Gear solenoid signal shorted to ground, or open
 
2nd Gear solenoid wring harness connector is damaged
 
2nd Gear solenoid is damaged or not properly installed
 
ATF level is low
 
Circuit harness connector contacts are corroded or ingresses of water
 
Circuit wires have shorted to each other, to battery or ground
 
Automatic Transmission Hydraulic Pressure Sensor 1 has failed
 
Transmission Control Module (TCM) needs replacing
 
Transmission Input Speed (RPM) Sensor has failed
 
Transmission Output Speed (RPM) Sensor has failed
 

Trouble Code: P0733



Incorrect Third Gear Ratio

Possible Causes:



3rd Gear solenoid harness connector not properly seated
 
3rd Gear solenoid signal shorted to ground, or open
 
3rd Gear solenoid wiring harness connector is damaged
 
3rd Gear solenoid is damaged or not properly installed
 
ATF level is low
 
Circuit harness connector contacts are corroded or ingresses of water
 
Circuit wires have shorted to each other, to battery or ground
 
Automatic Transmission Hydraulic Pressure Sensor 1 has failed
 
Transmission Control Module (TCM) needs replacing
 
Transmission Input Speed (RPM) Sensor has failed
 
Transmission Output Speed (RPM) Sensor has failed
 

Trouble Code: P0734



Incorrect Fourth Gear Ratio

Possible Causes:



4th Gear solenoid harness connector not properly seated
 
4th Gear solenoid signal shorted to ground, or open
 
4th Gear solenoid wiring harness connector is damaged
 
4th Gear solenoid is damaged or not properly installed
 
ATF level is low
 
Circuit harness connector contacts are corroded or ingresses of water
 
Circuit wires have shorted to each other, to battery or ground
 
Automatic Transmission Hydraulic Pressure Sensor 1 has failed
 
Transmission Control Module (TCM) needs replacing
 
Transmission Input Speed (RPM) Sensor has failed
 
Transmission Output Speed (RPM) Sensor has failed
 

Trouble Code: P0735



Incorrect Fifth Gear Ratio

Possible Causes:



5th Gear solenoid harness connector not properly seated
 
5th Gear solenoid signal shorted to ground, or open
 
5th Gear solenoid wiring harness connector is damaged
 
5th Gear solenoid is damaged or not properly installed
 
ATF level is low
 
Circuit harness connector contacts are corroded or ingresses of water
 
Circuit wires have shorted to each other, to battery or ground
 
Automatic Transmission Hydraulic Pressure Sensor 1 has failed
 
Transmission Control Module (TCM) needs replacing
 
Transmission Input Speed (RPM) Sensor has failed
 
Transmission Output Speed (RPM) Sensor has failed
 

Trouble Code: P0740



TCC Solenoid Circuit Malfunction

Possible Causes:



TCC solenoid control circuit is open or shorted to ground
 
TCC solenoid wiring harness connector is damaged
 
TCC solenoid is damaged or has failed
 

Trouble Code: P0743



TCC Solenoid Circuit Malfunction

Possible Causes:



TCC solenoid control circuit is open or shorted to ground
 
TCC solenoid wiring harness connector is damaged
 
TCC solenoid is damaged or has failed
 

Trouble Code: P0748



Pressure Regulator Valve 2 Upper Threshold

Possible Causes:



Pressure control solenoid circuit is shorting to ground
 
Pressure control solenoid circuit is open
 
Valve has failed
 
TCM has failed
 

Trouble Code: P0753



Solenoid Valve 1 Upper Threshold

Possible Causes:



Pressure control solenoid circuit is shorting to ground
 
Pressure control solenoid circuit is open
 
Valve has failed
 
TCM has failed
 

Trouble Code: P0758



Solenoid Valve 2 Upper Threshold

Possible Causes:



Pressure control solenoid circuit is shorting to ground
 
Pressure control solenoid circuit is open
 
Valve has failed
 
TCM has failed
 

Trouble Code: P0763



Solenoid Valve 3 Upper Threshold

Possible Causes:



Pressure control solenoid circuit is shorting to ground
 
Pressure control solenoid circuit is open
 
Valve has failed
 
TCM has failed
 

Trouble Code: P1178



O2 Sensor Switching Time

Possible Causes:



Oxygen sensor heater for oxygen sensor (HO2S) before catalytic converter is faulty
 
O2S is contaminated (due to presence of silicone in fuel)
 
O2S signal and ground circuit wires crossed in wiring harness
 
O2S signal circuit is shorted to sensor or chassis ground
 
O2S element before the catalytic converter has failed (internal short condition)
 
Leaks present in the exhaust manifold or exhaust pipes
 

Trouble Code: P1179



O2 Sensor Switching Time

Possible Causes:



Oxygen sensor heater for oxygen sensor (HO2S) before catalytic converter is faulty
 
O2S is contaminated (due to presence of silicone in fuel)
 
O2S signal and ground circuit wires crossed in wiring harness
 
O2S signal circuit is shorted to sensor or chassis ground
 
O2S element before the catalytic converter has failed (internal short condition)
 
Leaks present in the exhaust manifold or exhaust pipes
 

Trouble Code: P1396



Camshaft Position Sensor -A- Circ Malfunction

Possible Causes:



CMP sensor circuit is open or shorted to ground
 
CMP sensor circuit is shorted to power
 
CMP sensor ground (return) circuit is open
 
CMP sensor installation incorrect (Hall-effect type)
 
CMP sensor is damaged or CMP sensor shielding damaged
 

Trouble Code: P1403



Evaporative Emission System Shut Off Valve

Possible Causes:



EVAP power supply circuit is open
 
EVAP solenoid control circuit is open or shorted to ground
 
EVAP solenoid control circuit is shorted to power (B+)
 
EVAP solenoid valve is damaged or it has failed
 
EVAP canister has a leak or a poor seal
 

Trouble Code: P1511



Differentiated Intake Manifold Control Circuit Electrical

Possible Causes:



Leaky vacuum reservoir, vacuum lines loose or damaged
 
Vacuum solenoid or vacuum actuator is damaged
 
IMRC actuator cable/gears are seized, or the cables are improperly routed or seized
 
IMRC housing return springs are damaged or disconnected
 
Lever/shaft return stop may be obstructed or bent, or the lever/shaft wide open stop may be obstructed or bent, or the IMRC lever/shaft may be sticking, binding or disconnected
 
IMRC control circuit open, shorted or the VPWR circuit is open
 

Trouble Code: P1550



Idle Air Control Valve

Possible Causes:



Charge air system leaks
 
Recirculating valve for turbocharger is faulty
 
Turbocharging system is damaged
 
Vacuum diaphragm for turbocharger needs adjusting
 
Wastegate bypass regulator valve is faulty
 

Trouble Code: P1743



Pressure Regulator Valve 5 Upper Threshold

Possible Causes:



Pressure control solenoid circuit is shorting to ground
 
Pressure control solenoid circuit is open
 
Valve has failed
 
TCM has failed
 

 
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