NVH Forward or Reverse

WARNING: This page is about a different car, the 2011 Ford F550 Super Duty and 2011 Ford F450 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: NVH symptoms should be identified using the diagnostic tools that are available. For a list of these tools, an explanation of their uses and a glossary of common terms, refer to NOISE, VIBRATION & HARSHNESS article. Since it is possible any one of multiple systems may be the cause of a symptom, it may be necessary to use a process of elimination type of diagnostic approach to pinpoint the responsible system. If this is not the causal system for the symptom, refer back to NOISE, VIBRATION & HARSHNESS article for the next likely system and continue diagnosis.

DIAGNOSTIC ROUTINES - NVH FORWARD OR REVERSE

Possible Component	Reference/Action
257 - ROUTINE
Powertrain Control System	CARRY OUT On-Board Diagnostic (OBD) tests. REFER to the INTRODUCTION for diagnosis and testing of the PCM. REPAIR as required. CLEAR the DTCs, ROAD TEST the vehicle and RERUN the OBD test.
PCM, vehicle wiring harnesses, Power Take-Off (PTO) assembly
Transmission Fluid
Incorrect level	CHECK transmission fluid level and adjust as necessary. REFER to PRELIMINARY INSPECTION in this service information.
Condition	CARRY OUT the Transmission Fluid Condition Check. REFER to PRELIMINARY INSPECTION in this service information.
Partially blocked filter	INSTALL a new filter. CARRY OUT the line pressure tests. REPAIR or INSTALL new components as necessary.
Incorrect clutch apply pressure
Selector Lever Cable	INSPECT and REPAIR as necessary. REFER to AUTOMATIC TRANSMISSION EXTERNAL CONTROLS article.
Cable system damaged, misaligned, grounding out
Fluid Pump Assembly
Bolts not tightened to specification	TIGHTEN to specification.
Gasket damaged	INSTALL a new gasket. REPAIR as necessary.
Porosity, cross leaks, cup plug missing, plugged hole gears cracked or seized	INSTALL a new gasket. REPAIR as necessary.
One-Way Clutch (OWC)	REPAIR as necessary.
Worn, damaged or assembled incorrectly	REPAIR as necessary.
Other
Transmission fluid cooling tubes, transmission fluid fill tube grounding, driveshaft damaged	RELOCATE transmission fluid cooling tubes or transmission fluid fill tube correctly. INSPECT for damage. REPAIR as necessary. TIGHTEN to specifications.
Inspection cover loose
Gears	REPAIR as necessary.
Gear noise	REPAIR as necessary.
Main Control Solenoids or Valves	REPAIR as necessary.
Worn or damaged main control solenoids or valves	REPAIR as necessary.
Torque Converter Assembly	REMOVE the transmission. INSPECT for damage. REFER to TORQUE CONVERTER CONTAMINATION INSPECTION in this service information. If the torque converter fails to pass the criteria for replacement or is damaged, INSTALL a new or remanufactured torque converter.
Flexplate, torque converter assembly damaged
Transmission Insulator and Retainer
Transmission insulator and retainer bound or grounding out	INSPECT the insulator and retainer. Neutralize the powertrain mounts. REFER to NOISE, VIBRATION & HARSHNESS article. INSTALL a new insulator and retainer as necessary. TIGHTEN to specification. REFER to TRANSMISSION SUPPORT INSULATOR in this service information.
Transmission insulator and retainer broken or fasteners loose