What does RAM fault code P0734 mean?

Q: What does RAM fault code P0734 mean?

P0734 indicates: Slip Under Heavy Towing / Limp to 3rd Fix: LOGIC: Gear 4 Incorrect Ratio (K2 / B2 Clutch Slip). ACTION: Check Aisin-specific ATF fluid condition (Aisin JW3309 / Mobil ATF 3309). Install a pressure test gauge into the K2 clutch inspection port. Verify line pressure climbs above 180 PSI under stall test; inspect the K2 clutch piston housing for cracked welds.

RAM Fault Code

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P0734

Slip Under Heavy Towing / Limp to 3rd

System

Gear Ratio

Symptom

Slip Under Heavy Towing / Limp to 3rd

Diagnosis & fix steps

LOGIC: Gear 4 Incorrect Ratio (K2 / B2 Clutch Slip). ACTION: Check Aisin-specific ATF fluid condition (Aisin JW3309 / Mobil ATF 3309). Install a pressure test gauge into the K2 clutch inspection port. Verify line pressure climbs above 180 PSI under stall test; inspect the K2 clutch piston housing for cracked welds.

Red Seal field insights

Clutch Drum Fatigue: High torque from the 6.7L Cummins on Cab-and-Chassis applications stresses the welded input clutch drum. Micro-cracks along the piston drum seam bleed apply pressure under maximum working boost.

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.

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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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