P0B09 Cadillac Code - Auxiliary Transmission Fluid Pump Supply Voltage Relay Control Circuit
Quick Answer
The generator control module also called the starter generator control module is comprised of the following three control modules; the hybrid powertrain control module, 14 volt power module and the drive motor control module. Common causes include Faulty Starter Generator Control Module, Starter Generator Control Module harness is open or shorted, Starter Generator Control Module circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P0B09 Cadillac indicates Auxiliary Transmission Fluid Pump Supply Voltage Relay Control Circuit.
- Common causes
- Common causes include Faulty Starter Generator Control Module, Starter Generator Control Module harness is open or shorted, Starter Generator Control Module circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P0B09 Cadillac Description
The transmission fluid pump - auxiliary is used to maintain transmission fluid line pressure to the transmission during Autostop mode. The transmission fluid pump - auxiliary is externally mounted to the transmission case assembly. The hybrid powertrain control module controls the auxiliary pump by providing the ground path to the transmission pump relay - auxiliary coil control circuit.
What are the Possible Causes of the DTC P0B09 Cadillac?
- Faulty Starter Generator Control Module
- Starter Generator Control Module harness is open or shorted
- Starter Generator Control Module circuit poor electrical connection
How to Fix the DTC P0B09 Cadillac?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0B09 Cadillac code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P0B09 Cadillac Code
1. What does the OBDII code P0B09 mean on a Cadillac?
Code P0B09 indicates an issue with the Auxiliary Transmission Fluid Pump Supply Voltage Relay Control Circuit, which manages the electrical supply for the auxiliary transmission fluid pump.
2. What are common symptoms of the P0B09 code on a Cadillac?
Common symptoms include transmission overheating, reduced fuel efficiency, erratic shifting, or the vehicle entering limp mode.
3. What causes the P0B09 code on a Cadillac?
Possible causes include a faulty auxiliary transmission fluid pump relay, damaged wiring or connectors, a blown fuse, or a malfunctioning transmission control module (TCM).
4. Can I drive my Cadillac with the P0B09 code?
It is not recommended to drive for extended periods with this code, as it could lead to transmission overheating and potential damage.
5. How do I diagnose the P0B09 code on my Cadillac?
Diagnosis involves checking the relay, wiring, and connectors for damage, testing the auxiliary transmission fluid pump, and using a scan tool to monitor the TCM for voltage irregularities.
6. How is the P0B09 code repaired on a Cadillac?
Repairs may include replacing a faulty relay, repairing or replacing damaged wiring, cleaning or securing loose connections, or addressing issues with the TCM.
7. Does the P0B09 code require a software update on my Cadillac?
In some cases, a software update for the transmission control module may be needed to resolve the issue. Consult your dealer or mechanic to verify.
8. How much does it cost to fix the P0B09 code on a Cadillac?
Repair costs can vary but typically range from $100 to $500, depending on whether the issue is with the relay, wiring, or TCM.
9. Can a dead battery trigger the P0B09 code on a Cadillac?
Yes, a weak or dead battery can cause voltage irregularities, potentially triggering this code. Check your battery and charging system.
10. What tools are needed to troubleshoot the P0B09 code on a Cadillac?
You’ll need a digital multimeter, an OBDII scanner, and possibly a wiring diagram for your Cadillac model to diagnose the issue accurately.
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