NHTSA ID Number: 10189904
Manufacturer Communication Number: B20-032
TSB/Document Date: 2021-04-05
Summary
Service Bulletin - The AWD indicator comes on with DTC C1843-62 (left rear differential fluid pressure deviation) and/or DTC C1844-62 (right rear differential fluid pressure deviation).
Service Bulletin
March 29, 2021
20-032
Version 2
AWD Indicator Comes On with DTC C1843-62 or C1844-62
Supersedes 20-032, dated July 14, 2020, to revise the information highlighted in yellow.
AFFECTED VEHICLES
Year
Model
Trim Level
VIN Range
2019
RDX
All with AWD
ALL
2020
RDX
All with AWD
5J8TC2…LL000001 to 5J8TC2…LL029789
REVISION SUMMARY
Under AFFECTED VEHICLES, 2020 RDX was added and the 2019 RDX VIN range was revised.
SYMPTOM
The AWD indicator comes on with DTC C1843-62 (left rear differential fluid pressure deviation) and/or DTC C1844-62 (right
rear differential fluid pressure deviation).
POSSIBLE CAUSE
There is internal corrosion in the solenoids.
CORRECTIVE ACTION
Check the rear differential fluid level, and if OK, replace both rear differential solenoid valves.
PARTS INFORMATION
Part Name
Part Number
Quantity
Solenoid Assy., L. Linear
48360-5YP-013
1
Solenoid Assy., R. Linear
48350-5YP-013
1
Washer, Filler Plug (20 MM)
94109-20000
1
Part Name
Part Number
Quantity
All-Wheel Drive Fluid (DPSF)
08200-9007A
1 bottle will repair 5 vehicles.
REQUIRED MATERIALS
CLIENT INFORMATION: The information in this bulletin is intended for use only by skilled technicians who have the proper tools, equipment, and
training to correctly and safely maintain your vehicle. These procedures should not be attempted by “do-it-yourselfers,” and you should not assume this
bulletin applies to your vehicle, or that your vehicle has the condition described. To determine whether this information applies, contact an authorized
Acura
automobile dealer.
© 2021 American Honda Motor Co., Inc. – All Rights Reserved
Page 1 of 4
WARRANTY CLAIM INFORMATION
The normal warranty applies.
Operation
Number
Description
Flat Rate
Time
Defect
Code
Symptom
Code
Template
ID
Failed Part Number
2191BY
Replace both rear
differential solenoid
valves after checking
the rear differential
fluid.
0.5 hr
00801
03205
B20032A
48360-5YP-003
Skill Level: Repair Technician
INSPECTION PROCEDURE
1. Raise the vehicle on the lift. Refer to the service information.
2. Check the rear differential fluid, and make sure the fluid is at the same level as the filler plug hole.
•
•
If the fluid level is OK, install a new filler plug sealing washer and torque the filler plug to 35 N·m (26 lb-ft). Then, go
to REPAIR PROCEDURE.
If the fluid level is low, fill the rear differential with Acura All-Wheel Drive Fluid (DPSF) to the proper level. Refer to
the service information. Then, go to STEP 3.
3. Clear the DTCs, and test-drive the vehicle.
•
•
If the AWD indicator comes on with DTC C1843-62 (left rear differential fluid pressure deviation) and/or DTC
C1844-62 (right rear differential fluid pressure deviation), go to REPAIR PROCEDURE.
If the AWD indicator does not come on and no DTCs return, no further repairs are needed, this bulletin does not
apply.
Page 2 of 4
REPAIR PROCEDURE
Replace the left and right differential solenoid valves.
1. Remove the differential solenoid covers.
Page 3 of 4
2. Remove the differential solenoid valves.
NOTE: Before removing the solenoids, clean around each solenoid to prevent contamination from entering the
differential and/or the new replacement solenoid.
3. Install the new differential solenoid valves, and torque the bolt to 12 N·m (9 lb-ft).
NOTE: Lube the O-ring using Acura All-Wheel Drive Fluid (DPSF) before installing the differential solenoid valves to the
rear differential.
4. Install the differential solenoid covers, and torque the bolts to 12 N·m (9 lb-ft).
5. Do an All DTC check, and clear DTCs from all systems.
END
Page 4 of 4
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TSB/Document ID: B20-032
Replacement Service Bulletin Number:
MFR Communication Date: 2021-03-29
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: VEHICLE SPEED CONTROL
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