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Service bulletin B20-032

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10189904
Published by NHTSA2021-04-05
Manufacturer's numberB20-032
Manufacturer's date2021-03-29
NHTSA componentPOWER TRAIN; VEHICLE SPEED CONTROL

NHTSA's 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).

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Throttle and cruise control, Transmission and driveline

Trouble codes named

C1843, C1844

Vehicles listed
ACURA RDX2019, 2020

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Other bulletins for the same vehicles and component
B23-0102024-04-03. Service bulletin. Service Bulletin - During engine start in cold conditions, a miscalculation in the PCM causes the air-fuel ratio to exceed DTC rich criteria.
B21-0282021-12-03. Service bulletin. Service Bulletin - The MIL comes on with DTC P061B (PCM Internal Malfunction) is stored.
B21-0282021-11-03. Service bulletin. Service Bulletin - The MIL comes on with DTC P061B (PCM Internal Malfunction) is stored.
B21-0282021-09-09. Service bulletin. Service Bulletin - The MIL comes on with DTC P061B (PCM Internal Malfunction) is stored.
B20-0322021-09-02. Service bulletin. 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).
B21-0282021-08-13. Service bulletin. Service Bulletin - The MIL comes on with DTC P061B (PCM Internal Malfunction) is stored.
B21-0212021-06-11. Service bulletin. Service Bulletin - The MIL comes on with DTC P0236 (Turbocharger Boost Sensor Circuit Range/Performance Problem) stored.
B18-0452018-10-01. Service bulletin. Service bulletin - Some troubleshooting procedures for a loss of communication or F-CAN malfunction DTC?s require running the F-CAN Bus Connected Unit Check using the i-HDS. There are certain control units that may be reported as Not Available in the Status column even though they are properly communicating.