code p0c17/p0c18 drive motor 2 position not learned someone told me I might need a drive moyot position lean what you guys think allready cahnged the hybrid battery
@PeteCT @rockola1971
@PeteCT @rockola1971
2013 tahoe hybrid codes p0c17 / p0c18
- Thread starter columbusr
- Start date
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@columbusr Moved you here from Site News.
here's what I see for those codes.
DTC P0C17 Or P0C18
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle (with HP2) prior to using this diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic approach.
Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC P0C17
Drive Motor 1 Position Not Learned
DTC P0C18
Drive Motor 2 Position Not Learned
Circuit/System Description
The drive motor generator position sensor is monitored by the motor control module (MCM). The MCM
monitors the angular position, speed and direction of the drive motor generator based upon the signals
of the resolver-type position sensor. The position sensor, or resolver, contains a drive coil, two driven
coils and an irregular shaped metallic rotor. The metallic rotor is mechanically attached to the shaft of the
drive motor generator. At ignition ON, the MCM outputs a 7 volt ac, 10 kHz excitation signal to the drive
coil. The drive coil excitation signal creates a magnetic field surrounding the two driven coils and the
irregular shaped rotor. The MCM then monitors the two driven coil circuits for a return signal. The
position of the irregular shaped metallic rotor causes the magnetically-induced return signals of the
driven coils to vary in size and shape. A comparison of the two driven coil signals allows the MCM to
determine the exact position, speed and direction of the drive motor generator.
The position sensor is a non-serviceable part of the drive motor generator assembly.
Offset is the relationship between the position sensor and the drive motor generator output shaft.
Whenever the ignition is cycled to OFF, the MCM attempts to learn the offset of the drive motor position
sensor. The MCM will attempt to learn the position at hybrid wake-up (ignition ON) only if no valid offset
value has ever been learned. This condition would normally occur only after an MCM reprogramming
event.
Conditions For Running The DTC
Condition 1, 2, 3 And 4
Hybrid wake-up signal is active.
The MCM has not previously learned a valid drive motor position sensor offset value.
Condition 2
Motor speed is less than 20 RPM.
Conditions For Setting The DTC
Condition 1
Position sensor offset value not learned because drive motor speed is greater than 50 RPM.
Condition 2
Position sensor offset value not learned because hybrid battery voltage is less than 192V.
Condition 3
Position sensor offset value not learned because drive motor phase to phase current difference is less
than 15 A.
Condition 4
Position sensor offset value not learned because offset learn value is greater than 25 degrees.
Action Taken When The DTC Sets
P0C17 and P0C18 are Type B DTCs.
Conditions For Clearing The DTC
P0C17 and P0C18 are Type B DTCs.
Reference Information
Schematic Reference
Hybrid Controls Schematics
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
1. Ignition OFF, wait 2 minutes.
2. Ignition ON, wait 2 minutes and then turn ignition OFF.
3. Ignition ON, monitor DTC Status. DTC P0C17 and P0C18 should have passed last test.
1. If the DTC has passed, clear DTC Information. No further diagnosis is necessary.
Circuit/System Testing
1. Inspect for DTCs P0A40, P0A45, P0A46, P0A78, P0A79, P0A3F, P0C05, P0C08, P0C0B, P0C0E,
P0C4E, P0C4F, P0C52, P0C53, P0C57, P0C58, P0C61, P0C62, P0C5C, P0C5D, P1B03, P1B04 or
P1B0D.
1. If any of the above DTCs are set, diagnose and repair them prior to performing this diagnostic.
2. Ignition ON, engine OFF. Observe the HPCM 300V Circuit parameter. The hybrid battery voltage
should be greater than 192V.
1. If the hybrid battery voltage is less than 192V perform the Jump Assist procedure and attempt
to successfully charge the hybrid battery. Re-test for this DTC after the Jump Assist procedure
is complete. Refer to Jump Assist .
3. Turn the ignition OFF and wait 2 minutes.
4. Turn the ignition ON without cranking the engine. Monitor DTC Status. DTC P0C17 and P0C18
should have passed last test.
1. If DTC P0C4E or P0C4F sets, proceed to that diagnostic procedure.
2. If DTC P0C17 and P0C18 have passed, clear DTC Information. No further diagnosis is
necessary.
3. If DTC P0C17 or P0C18 resets, program the PIM with the latest software version and recheck
for DTCs. If the DTC resets after programming or if the PIM already contains the latest
software version, replace the drive motor generator assembly.
Repair Procedures
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Drive Motor with Generator Assembly Removal - 1st Position
Drive Motor with Generator Assembly Removal - 2nd Position
DTC P0C17 Or P0C18
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle (with HP2) prior to using this diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic approach.
Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC P0C17
Drive Motor 1 Position Not Learned
DTC P0C18
Drive Motor 2 Position Not Learned
Circuit/System Description
The drive motor generator position sensor is monitored by the motor control module (MCM). The MCM
monitors the angular position, speed and direction of the drive motor generator based upon the signals
of the resolver-type position sensor. The position sensor, or resolver, contains a drive coil, two driven
coils and an irregular shaped metallic rotor. The metallic rotor is mechanically attached to the shaft of the
drive motor generator. At ignition ON, the MCM outputs a 7 volt ac, 10 kHz excitation signal to the drive
coil. The drive coil excitation signal creates a magnetic field surrounding the two driven coils and the
irregular shaped rotor. The MCM then monitors the two driven coil circuits for a return signal. The
position of the irregular shaped metallic rotor causes the magnetically-induced return signals of the
driven coils to vary in size and shape. A comparison of the two driven coil signals allows the MCM to
determine the exact position, speed and direction of the drive motor generator.
The position sensor is a non-serviceable part of the drive motor generator assembly.
Offset is the relationship between the position sensor and the drive motor generator output shaft.
Whenever the ignition is cycled to OFF, the MCM attempts to learn the offset of the drive motor position
sensor. The MCM will attempt to learn the position at hybrid wake-up (ignition ON) only if no valid offset
value has ever been learned. This condition would normally occur only after an MCM reprogramming
event.
Conditions For Running The DTC
Condition 1, 2, 3 And 4
Hybrid wake-up signal is active.
The MCM has not previously learned a valid drive motor position sensor offset value.
Condition 2
Motor speed is less than 20 RPM.
Conditions For Setting The DTC
Condition 1
Position sensor offset value not learned because drive motor speed is greater than 50 RPM.
Condition 2
Position sensor offset value not learned because hybrid battery voltage is less than 192V.
Condition 3
Position sensor offset value not learned because drive motor phase to phase current difference is less
than 15 A.
Condition 4
Position sensor offset value not learned because offset learn value is greater than 25 degrees.
Action Taken When The DTC Sets
P0C17 and P0C18 are Type B DTCs.
Conditions For Clearing The DTC
P0C17 and P0C18 are Type B DTCs.
Reference Information
Schematic Reference
Hybrid Controls Schematics
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
1. Ignition OFF, wait 2 minutes.
2. Ignition ON, wait 2 minutes and then turn ignition OFF.
3. Ignition ON, monitor DTC Status. DTC P0C17 and P0C18 should have passed last test.
1. If the DTC has passed, clear DTC Information. No further diagnosis is necessary.
Circuit/System Testing
1. Inspect for DTCs P0A40, P0A45, P0A46, P0A78, P0A79, P0A3F, P0C05, P0C08, P0C0B, P0C0E,
P0C4E, P0C4F, P0C52, P0C53, P0C57, P0C58, P0C61, P0C62, P0C5C, P0C5D, P1B03, P1B04 or
P1B0D.
1. If any of the above DTCs are set, diagnose and repair them prior to performing this diagnostic.
2. Ignition ON, engine OFF. Observe the HPCM 300V Circuit parameter. The hybrid battery voltage
should be greater than 192V.
1. If the hybrid battery voltage is less than 192V perform the Jump Assist procedure and attempt
to successfully charge the hybrid battery. Re-test for this DTC after the Jump Assist procedure
is complete. Refer to Jump Assist .
3. Turn the ignition OFF and wait 2 minutes.
4. Turn the ignition ON without cranking the engine. Monitor DTC Status. DTC P0C17 and P0C18
should have passed last test.
1. If DTC P0C4E or P0C4F sets, proceed to that diagnostic procedure.
2. If DTC P0C17 and P0C18 have passed, clear DTC Information. No further diagnosis is
necessary.
3. If DTC P0C17 or P0C18 resets, program the PIM with the latest software version and recheck
for DTCs. If the DTC resets after programming or if the PIM already contains the latest
software version, replace the drive motor generator assembly.
Repair Procedures
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Drive Motor with Generator Assembly Removal - 1st Position
Drive Motor with Generator Assembly Removal - 2nd Position
you gotta have a good level scanner that can read the codes of the 20 something moduals in these trucks. there's 57 reasons why they won't start and no way to guess without good data.
could be anything from hitting a pot hole sets off the crash fault code that has to be cleared to start, there's another one I can't remember too. from there, you can lose 300v isolation and fail a start up test that's run before the contractors close. to many many other things. gm quality wiring harnesses fail on normal trucks with high mileage, but these have more places to fail.
you'll basically have to learn to trouble shoot yourself if you want to keep it, as the dealer techs that were trained on these trucks are long gone and no one else wants to touch them. Just quote you some repair cost higher than a replacement.
if you can get some codes, we can try and work thru it.
