The P0948: Hydraulic Pump Relay Circuit High refers to an issue where the voltage in the hydraulic pump relay circuit is higher than expected. This can lead to improper operation of the hydraulic pump, potentially affecting the transmission’s hydraulic pressure regulation.
P0948 – Quick Overview
| Code | Information |
|---|---|
| Meaning | P0948: Hydraulic Pump Relay Circuit High |
| Is it serious? | Yes, high voltage in the hydraulic pump relay circuit can cause overvoltage damage and affect the transmission’s ability to regulate hydraulic pressure properly. |
| Possible causes | – High voltage in the hydraulic pump relay circuit – Faulty hydraulic pump relay – Wiring or connector issues |
| How to diagnose? | – Check the circuit for high voltage – Inspect wiring and connectors – Replace the hydraulic pump relay if necessary |
P0948 Meaning
The P0948: Hydraulic Pump Relay Circuit High code indicates that the voltage in the hydraulic pump relay circuit exceeds the expected range, which can lead to the malfunction of the hydraulic pump. This can result in improper regulation of hydraulic pressure in the transmission, affecting its performance and durability.
Step-by-step diagnostic guide
| Action | Description | Tools Needed |
|---|---|---|
| Check for Other Codes | Use an OBD-II scanner to look for additional fault codes that may help identify related issues in the hydraulic pump circuit. | OBD-II Scanner |
| Test the Circuit for High Voltage | Use a multimeter to check for high voltage in the hydraulic pump relay circuit. Compare the readings to the manufacturer’s specifications. | Multimeter |
| Inspect Wiring and Connectors | Inspect all wiring and connectors leading to the hydraulic pump relay for signs of damage, corrosion, or loose connections. | Flashlight, Multimeter |
| Check the Hydraulic Pump Relay | Test the hydraulic pump relay for proper functionality. Replace the relay if it is faulty or contributing to the high voltage. | Diagnostic Tool, Replacement Relay |
| Clear the Code and Test Drive | After repairs, clear the code using an OBD-II scanner and take the vehicle for a test drive to confirm that the issue is resolved. | OBD-II Scanner, Vehicle Owner’s Manual |
| Recheck for Codes | Re-scan the system to ensure the P0948 code does not return after the test drive. | OBD-II Scanner |
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I test OBD-II scanners and make DIY Engine diagnostics guides to help you solve your car problems without having to depend on the mechanic. A lot of them will try to scam you or are just no help at all. About Juraj Lukacko