DeVille, Eldorado, Seville 1999-2005

4.6L V8 VIN Y Auto 6

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Trouble Code: P1610



Loss of Platform Zone Module Serial Data

Possible Causes:



Check the serial data circuit for a poor connection at the PZM
 
Perform the PZM System Check
 
Perform the Powertrain Onboard Diagnostic System Check
 

Trouble Code: P1611



Loss of CVRTD Serial Data

Possible Causes:



Check the serial data circuit for poor connections at the CVRSS
 
Perform the CVRSS System Diagnosis
 
Perform the Powertrain Onboard Diagnostic System Check
 

Trouble Code: P1617



Engine Oil Level Switch Circuit Malfunction Code

Possible Causes:



Engine oil level too low or too high
 
Engine oil level switch circuit shorted to ground
 
Engine oil level switch is damaged or has failed
 
PCM has failed
 

Trouble Code: P1621



Control Module Long Term Memory Performance

Possible Causes:



Perform the Diagnostic System Check for the Engine Controls
 
PCM may have failed. Clear codes and then retest for the same code. If this codes resets, replace the PCM and reprogram it.
 

Trouble Code: P1624



Customer Snapshot - Data Available

Possible Causes:



Read and record any diagnostic trouble codes that are stored
 
Perform the Diagnostic System Check for Engine Controls
 

Trouble Code: P1626



Theft Deterrent System Fuel Enable Circuit Malfunction

Possible Causes:



Perform the Powertrain Onboard Diagnostic System Check
 
If DTC P1604 is also set, refer to the repair chart for the Loss of IPC Serial Data (the most likely cause is lost communications)
 

Trouble Code: P1630



Theft Deterrent System - Learn Mode Active

Possible Causes:



Refer to Programming the Theft Deterrent System
 
Perform the Powertrain Onboard Diagnostic System Check
 

Trouble Code: P1631



Theft Deterrent System - Start Enable Signal Not Current

Possible Causes:



Refer to Programming the Theft Deterrent System
 
Perform the Powertrain Onboard Diagnostic System Check
 

Trouble Code: P1633



Ignition Supplement Power (0) Switch Circuit Malfunction

Possible Causes:



Ignition OFF/RUN/CRANK circuit is open or shorted to power
 
Ignition switch is damaged or has failed
 
PCM has failed
 

Trouble Code: P1635



5-Volt Reference 1 Circuit Malfunction

Possible Causes:



5v VREF circuit is shorted to sensor ground or chassis ground
 
5v VREF circuit or MAP sensor circuit is shorted to power (B+)
 
5v VREF circuit shorted to EGR sensor High signal circuit
 
EGR solenoid valve (and sensor) is damaged or has failed
 
PCM has failed
 

Trouble Code: P1639



5-Volt Reference 2 Circuit Malfunction

Possible Causes:



ACP sensor VREF or FTP sensor VREF circuit is open, shorted to ground or to power
 
A/C refrigerant pressure or the Fuel Tank pressure sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P1640



Output Driver 2 Input Voltage High Input

Possible Causes:



Generator is over charging - check the generator output
 
Generator 'L' terminal is loose (an intermittent fault)
 
PCM has failed
 

Trouble Code: P1641



MIL Control Circuit Malfunction

Possible Causes:



MIL control circuit is open, shorted to ground or to power (B+)
 
MIL (lamp) is damaged or failed (located in Instrument Cluster)
 
MIL power circuit is in the Instrument cluster
 
PCM has failed
 
TSB 71-65-26 contains a repair procedure for this code
 

Trouble Code: P1642



Vehicle Speed Output Signal Circuit Malfunction

Possible Causes:



VSS output signal circuit is open, shorted to ground or to B+
 
PCM has failed
 

Trouble Code: P1644



Traction Control Delivered Torque Output Circuit Malfunction

Possible Causes:



Delivered torque circuit is open, shorted to ground or to B+
 
EBCM is damaged or has failed
 
PCM has failed
 

Trouble Code: P1645



EVAP Solenoid Control Circuit Malfunction

Possible Causes:



EVAP solenoid control circuit is open or shorted to ground
 
EVAP solenoid power circuit is open (check the ECS fuse)
 
EVAP solenoid is damaged or has failed
 
PCM has failed
 

Trouble Code: P1646



EVAP Vent Solenoid Control Circuit Malfunction

Possible Causes:



EVAP vent solenoid circuit is open or shorted to ground
 
EVAP vent solenoid power circuit is open (test SHIFTSOL fuse)
 
EVAP vent solenoid is damaged or has failed
 
PCM has failed
 

Trouble Code: P1650



Output Driver 2 Input Voltage High Input

Possible Causes:



Generator is over charging - check the generator output
 
Generator 'L' terminal is loose (an intermittent fault)
 
PCM has failed
 

Trouble Code: P1652



Powertrain Induced Chassis Pitch Output Circuit Malfunction

Possible Causes:



Chassis pitch output circuit is open, shorted to ground or to B+
 
Electronic Suspension Control Module has failed
 
PCM has failed
 
TSB 71-65-25 contains a repair procedure for this code
 

Trouble Code: P1654



Cruise Inhibit Output Circuit Malfunction

Possible Causes:



Cruise inhibit output control circuit is open, shorted to ground or shorted to power (B+)
 
Cruise control module has failed
 
PCM has failed
 
TSB 71-65-25 contains a repair procedure for this code
 

Trouble Code: P1660



Cooling Fan Relay Control Circuit Malfunction

Possible Causes:



Cooling fan relay control circuit is open or shorted to ground
 
Cooling fan relay control circuit is shorted to system power
 
Cooling fan relay power circuit is open (check CLNC FAN fuse)
 
Cooling fan relay is damaged or has failed
 
PCM has failed
 

Trouble Code: P1680



Powertrain Control Module Internal Malfunction

Possible Causes:



Clear the codes and then recheck for this trouble code. If the same code resets, the PCM is damaged and must be replaced (and the new PCM must be programmed) to repair this code.
 

Trouble Code: P1681



Powertrain Control Module Internal Malfunction

Possible Causes:



Clear the codes and then recheck for this trouble code. If the same code resets, the PCM is damaged and must be replaced (and the new PCM must be programmed) to repair this code.
 

Trouble Code: P1683



Powertrain Control Module Internal Malfunction

Possible Causes:



Clear the codes and then recheck for this trouble code. If the same code resets, the PCM is damaged and must be replaced (and the new PCM must be programmed) to repair this code.
 

Trouble Code: P1810



TFP Valve Position Switch Malfunction (4T80-E)

Possible Causes:



Inspect the transmission linkage from the gear select lever to the manual valve for proper adjustment
 
TFP valve position switch signal circuit is open or grounded
 
TFP valve position switch circuit shorted to another signal
 
TFP valve position switch is damaged or has failed
 
PCM has failed
 

Trouble Code: P1811



Maximum Adaptive and Long Term Shift (4T80-E)

Possible Causes:



Ask the customer about overloading the vehicle, exceeding the trailer-towing limit, or towing while in Overdrive position.
 
ATF level is low, or the fluid is contaminated or burnt
 
The line pressure is too low
 
The pressure control solenoid valve is stuck "on" or pressure control solenoid valve has a broken clamp causing leakage.
 
The clutch plates (431 through 435) are burned or damaged.
 
The 2nd clutch piston assembly is cracked or damaged.
 
The 2nd clutch return spring and retainer assembly is damaged or out of position, or the 2nd clutch piston assembly seals are rolled, damaged or leaking.
 
The 2nd sprag clutch assembly is damaged or not holding.
 
The 1-2 shift solenoid valve stuck "on", or 1-2 shift valves (A & B) are stuck in 1st gear.
 

Trouble Code: P1814



Torque Converter Overstressed (4T65-E, 4T80-E)

Possible Causes:



ATF level is low or the fluid is burnt or contaminated
 
ATF filter is clogged or not properly installed/seated
 
Vehicle used for towing or driven while overloaded
 

Trouble Code: P1820



Internal Mode Switch 'A' Circuit Low Input (4T80-E)

Possible Causes:



IMS Signal 'A' circuit is shorted to ground
 
Transmission has internal problems / may need an overhaul
 

Trouble Code: P1822



Internal Mode Switch 'B' Circuit Low Input (4T80-E)

Possible Causes:



IMS Signal 'B' circuit is open or has a high resistance condition
 
Transmission has internal problems / may need an overhaul
 

Trouble Code: P1825



Internal Mode Switch 'P' Circuit Low Input (4T80-E)

Possible Causes:



IMS Signal 'P' circuit is shorted to sensor or chassis ground
 
Transmission has internal problems / may need an overhaul
 

Trouble Code: P1842



1-2 Shift Solenoid Circuit Low Input (4T80-E)

Possible Causes:



A/T 1-2 SS control circuit is open or shorted to ground
 
A/T 1-2 SS power circuit is open (check the TRANS fuse)
 
A/T 1-2 SS (solenoid) has failed, or the PCM has failed
 

Trouble Code: P1843



1-2 Shift Solenoid Circuit High Input (4T80-E)

Possible Causes:



A/T 1-2 SS control circuit is shorted to system power (B+)
 
A/T 1-2 SS (solenoid) is damaged or has failed
 
PCM has failed
 

Trouble Code: P1845



2-3 Shift Solenoid Circuit Low Input (4T80-E)

Possible Causes:



A/T 2-3 SS control circuit is open or shorted to ground
 
A/T 2-3 SS power circuit is open (check the TRANS fuse)
 
A/T 2-3 SS (solenoid) is damaged or has failed
 
PCM has failed
 

Trouble Code: P1847



2-3 Shift Solenoid Circuit High Input (4T80-E)

Possible Causes:



A/T 2-3 SS control circuit is shorted to system power (B+)
 
A/T 2-3 SS (solenoid) is damaged or has failed
 
PCM has failed
 

Trouble Code: P1860



TCC PWM Solenoid Circuit Malfunction (4T80-E)

Possible Causes:



TCC solenoid control circuit is open or shorted to ground
 
TCC solenoid control circuit is shorted to system power (B+)
 
TCC solenoid power circuit is open (check the TRANS fuse)
 
TCC solenoid is damaged or has failed
 
PCM has failed
 

Trouble Code: P1868



Transmission Fluid Life (4T80-E)

Possible Causes:



Change the ATF (fluid) and transmission filter and refill the fluid to the correct fluid level
 
Reset Transmission Oil Life Monitor to 100% with a Scan Tool
 
Check for transmission cooling system blockage and restriction
 

Trouble Code: U1000



Class 2 Communication Malfunction

Possible Causes:



Class 2 circuit is open, shorted to ground or shorted to power
 
PCM ignition power circuit(s) has a high resistance condition
 
PCM main ground circuit(s) has a high resistance condition
 
SDM (module) could be shorted pulling the voltage low
 

Trouble Code: U1016



No Communication With Powertrain Control Module

Possible Causes:



PCM Class 2 circuit is open, shorted to ground or to B+
 
PCM ignition power circuit(s) has a high resistance condition
 
PCM main ground circuit(s) has a high resistance condition
 
PCM (module) may have failed and is pulling the circuit low
 

Trouble Code: U1048



No Communication With Rear Wheel Steering Control Module

Possible Causes:



RWSCM Class 2 circuit is open, shorted to ground or to B+
 
RWSCM ignition power circuit has a high resistance condition
 
RESCM main ground circuit(s) has a high resistance condition
 
RESCM (module) may have failed and is pulling the circuit low
 

Trouble Code: U1064



No Communication With Body Control Module

Possible Causes:



BCM Class 2 circuit is open, shorted to ground or to B+
 
BCM ignition power circuit has a high resistance condition
 
BCM main ground circuit(s) has a high resistance condition
 
BCM (module) may have failed and is pulling the circuit low
 

 
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