Volvo Construction Fault Code
Free · no signupPPID 1156
High Temp Alarm / Hydraulic Sluggishness
System
Hydraulic Cooling
Symptom
High Temp Alarm / Hydraulic Sluggishness
Diagnosis & fix steps
LOGIC: Hydraulic Oil Temperature Signal Above Normal Limit.
ACTION: Verify hydraulic oil cooler fan operation. Inspect hydraulic cooler core for external debris blockage and check thermal bypass valve function.
Red Seal field insights
High oil temp thins hydraulic fluid rapidly, increasing internal pump slippage and leading to premature component wear if operated continuously.
Same code keeps coming back?
That's a program problem, not a part problem. Book a 30-minute uptime review with Grant, a Red Seal Heavy Duty Technician.
Read before you touch anything
- This is general reference information, not a repair manual. It is for trained, qualified technicians.
- Fault codes, meanings and procedures vary by model, serial number and software version. Confirm the code and the procedure against the manufacturer's service manual before acting.
- Follow the OEM service manual, torque specs and your site's safety procedures: lockout/tagout, block raised equipment, relieve hydraulic, fuel and air pressure, and let hot systems cool.
- You use this information at your own risk. Adventure Mechanical and AM Fleet Integrity accept no liability for damage, injury, downtime or loss arising from its use.
- Not affiliated with or endorsed by any manufacturer. Brand names are used only to identify the equipment a code applies to.
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