Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSHYUNDAI2009SONATA SE, 3.3 FREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 4 (AUTOMATIC TRANSAXLE SYSTEM (A5GF1))TROUBLESHOOTINGP0880 TCM POWER SIGNAL ERROR OPEN/SHORT (GND)SIGNAL CIRCUIT INSPECTIONCHECK A/T CONTROL RELAY HARNESS
2009 Hyundai Sonata SE, 3.3 F
Check A/T Control Relay Harness
2009 Hyundai Sonata SE, 3.3 FSECTION Check A/T Control Relay Harness
WARNING: This page is about a different variant/trim than selected.
- Ignition "OFF".
- Disconnect the "A/T CONTROL RELAY" connector
- Measure the voltage between terminal "4" of the "A/T CONTROL RELAY" harness connector and chassis ground.
- Turn ignition switch OFF → ON
Specification : 12V is measured only for approx. 0.5sec
- Is resistance within specifications?
YES
- Go to "CHECK SUPPLYING POWER TO SOLENOID VALVE " procedure
NO
- Check for open in harness. Repair as necessary and Go to "VERIFICATION OF VEHICLE REPAIR " procedure
- If signal circuit is OK, Substitute with a known-good PCM/TCM and check for proper operation. If the problem is corrected, replace PCM/TCM and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.