TSB: MACK ASET, CH, CHK SERIES, CHU, CL, CLASS 6, CLASS 7, CLASS 8, CRD SERIES, CRD112/113, CRD200, CRD92/93, CS 300, CS 300P, CS SERIES, CV, CX, CXU, DM, DM SERIES, DM400, DM600, DM807, DM809, DM811, DMM SERIES, E6, E7, F SERIES, FDM, FREEDOM, GU, J-TECH, LE, LR, M35AK, M65BX, MACK, MB SERIES, MC400, MC600, MH, MIDLINER, MIDR, MR, MR SERIES, MR400, MR600, MS SERIES, MS200P, MS300, MS300P, R, RB, RD, RD SERIES, RM SERIES, RW SERIES, SR70, T200, T2060A, T2090L, T2090LR, T300, TD, U, V-MAC, V-MAC III, WL, WS

Bulletin K24413634 — January 25, 2018

Bulletin Details

Bulletin IDK24413634
ManufacturerMACK
ModelsASET, CH, CHK SERIES, CHU, CL, CLASS 6, CLASS 7, CLASS 8, CRD SERIES, CRD112/113, CRD200, CRD92/93, CS 300, CS 300P, CS SERIES, CV, CX, CXU, DM, DM SERIES, DM400, DM600, DM807, DM809, DM811, DMM SERIES, E6, E7, F SERIES, FDM, FREEDOM, GU, J-TECH, LE, LR, M35AK, M65BX, MACK, MB SERIES, MC400, MC600, MH, MIDLINER, MIDR, MR, MR SERIES, MR400, MR600, MS SERIES, MS200P, MS300, MS300P, R, RB, RD, RD SERIES, RM SERIES, RW SERIES, SR70, T200, T2060A, T2090L, T2090LR, T300, TD, U, V-MAC, V-MAC III, WL, WS
Date IssuedJanuary 25, 2018
Date Added to NHTSAMarch 12, 2018
ComponentELECTRICAL SYSTEM
Vehicles Affected70 combinations

What is a TSB?

A Technical Service Bulletin is a document issued by the vehicle manufacturer to inform dealership technicians about a known issue and the recommended repair procedure. TSBs are not mandatory recalls — they serve as repair guidance for common problems.

If your vehicle has this issue, bring this bulletin ID to your dealer. If under warranty, the repair should be covered at no cost.

Summary

Mack Chassis - Diagnostic Trouble Code ( DTC ) / Fault Code SPN 1231 FMI 9 Inactive On DTC Readout, Counts In Multiples Of Three - US10 Emissions.Reworded for clarity, added link to related CBR solution.

Affected Vehicles

MakeModelYearComponent
MACK ASET 110000 ELECTRICAL SYSTEM
MACK CH 110000 ELECTRICAL SYSTEM
MACK CHK SERIES 110000 ELECTRICAL SYSTEM
MACK CHU 110000 ELECTRICAL SYSTEM
MACK CL 110000 ELECTRICAL SYSTEM
MACK CLASS 6 110000 ELECTRICAL SYSTEM
MACK CLASS 7 110000 ELECTRICAL SYSTEM
MACK CLASS 8 110000 ELECTRICAL SYSTEM
MACK CRD SERIES 110000 ELECTRICAL SYSTEM
MACK CRD112/113 110000 ELECTRICAL SYSTEM
MACK CRD200 110000 ELECTRICAL SYSTEM
MACK CRD92/93 110000 ELECTRICAL SYSTEM
MACK CS 300 110000 ELECTRICAL SYSTEM
MACK CS 300P 110000 ELECTRICAL SYSTEM
MACK CS SERIES 110000 ELECTRICAL SYSTEM
MACK CV 110000 ELECTRICAL SYSTEM
MACK CX 110000 ELECTRICAL SYSTEM
MACK CXU 110000 ELECTRICAL SYSTEM
MACK DM 110000 ELECTRICAL SYSTEM
MACK DM SERIES 110000 ELECTRICAL SYSTEM
MACK DM400 110000 ELECTRICAL SYSTEM
MACK DM600 110000 ELECTRICAL SYSTEM
MACK DM807 110000 ELECTRICAL SYSTEM
MACK DM809 110000 ELECTRICAL SYSTEM
MACK DM811 110000 ELECTRICAL SYSTEM
MACK DMM SERIES 110000 ELECTRICAL SYSTEM
MACK E6 110000 ELECTRICAL SYSTEM
MACK E7 110000 ELECTRICAL SYSTEM
MACK F SERIES 110000 ELECTRICAL SYSTEM
MACK FDM 110000 ELECTRICAL SYSTEM
MACK FREEDOM 110000 ELECTRICAL SYSTEM
MACK GU 110000 ELECTRICAL SYSTEM
MACK J-TECH 110000 ELECTRICAL SYSTEM
MACK LE 110000 ELECTRICAL SYSTEM
MACK LR 110000 ELECTRICAL SYSTEM
MACK M35AK 110000 ELECTRICAL SYSTEM
MACK M65BX 110000 ELECTRICAL SYSTEM
MACK MACK 110000 ELECTRICAL SYSTEM
MACK MB SERIES 110000 ELECTRICAL SYSTEM
MACK MC400 110000 ELECTRICAL SYSTEM
MACK MC600 110000 ELECTRICAL SYSTEM
MACK MH 110000 ELECTRICAL SYSTEM
MACK MIDLINER 110000 ELECTRICAL SYSTEM
MACK MIDR 110000 ELECTRICAL SYSTEM
MACK MR 110000 ELECTRICAL SYSTEM
MACK MR SERIES 110000 ELECTRICAL SYSTEM
MACK MR400 110000 ELECTRICAL SYSTEM
MACK MR600 110000 ELECTRICAL SYSTEM
MACK MS SERIES 110000 ELECTRICAL SYSTEM
MACK MS200P 110000 ELECTRICAL SYSTEM
MACK MS300 110000 ELECTRICAL SYSTEM
MACK MS300P 110000 ELECTRICAL SYSTEM
MACK R 110000 ELECTRICAL SYSTEM
MACK RB 110000 ELECTRICAL SYSTEM
MACK RD 110000 ELECTRICAL SYSTEM
MACK RD SERIES 110000 ELECTRICAL SYSTEM
MACK RM SERIES 110000 ELECTRICAL SYSTEM
MACK RW SERIES 110000 ELECTRICAL SYSTEM
MACK SR70 110000 ELECTRICAL SYSTEM
MACK T200 110000 ELECTRICAL SYSTEM
MACK T2060A 110000 ELECTRICAL SYSTEM
MACK T2090L 110000 ELECTRICAL SYSTEM
MACK T2090LR 110000 ELECTRICAL SYSTEM
MACK T300 110000 ELECTRICAL SYSTEM
MACK TD 110000 ELECTRICAL SYSTEM
MACK U 110000 ELECTRICAL SYSTEM
MACK V-MAC 110000 ELECTRICAL SYSTEM
MACK V-MAC III 110000 ELECTRICAL SYSTEM
MACK WL 110000 ELECTRICAL SYSTEM
MACK WS 110000 ELECTRICAL SYSTEM

Related MACK Recalls

CampaignModelYearComponentSummary
ANTHEM AN (4) 2026 SERVICE BRAKES, AIR:ANTILOCK:CONTROL ... Mack Trucks, Inc. (Mack) is recalling certain 2025-2027 Pioneer (4) and 2026-...
ANTHEM AN (4) 2027 SERVICE BRAKES, AIR:ANTILOCK:CONTROL ... Mack Trucks, Inc. (Mack) is recalling certain 2025-2027 Pioneer (4) and 2026-...
PIONEER PR (4) 2025 SERVICE BRAKES, AIR:ANTILOCK:CONTROL ... Mack Trucks, Inc. (Mack) is recalling certain 2025-2027 Pioneer (4) and 2026-...
PIONEER PR (4) 2026 SERVICE BRAKES, AIR:ANTILOCK:CONTROL ... Mack Trucks, Inc. (Mack) is recalling certain 2025-2027 Pioneer (4) and 2026-...
PIONEER PR (4) 2027 SERVICE BRAKES, AIR:ANTILOCK:CONTROL ... Mack Trucks, Inc. (Mack) is recalling certain 2025-2027 Pioneer (4) and 2026-...

What Should You Do?

If your vehicle is affected by this TSB, contact your authorized MACK dealer. Bring this bulletin ID (K24413634) when you visit. If under warranty, the repair should be free. If your warranty has expired, ask about goodwill coverage — manufacturers sometimes cover TSB-related repairs beyond the warranty period.

Frequently Asked Questions

A recall is a mandatory safety fix — the manufacturer must repair every affected vehicle for free. A TSB is an advisory document that describes a known issue and the recommended fix, but repairs are not required. However, some TSBs eventually lead to recalls if the issue poses a safety risk. TSBs are generally issued for quality or performance problems, while recalls address safety defects.

If your vehicle is still under the manufacturer's warranty, TSB-related repairs are typically covered at no cost. If your warranty has expired, you can ask the dealer about goodwill or customer assistance programs. Many manufacturers will cover or partially cover repairs for well-known issues, especially if the TSB was issued recently or affects a large number of vehicles.

Check the make, model, and model year listed above against your vehicle. If they match, this bulletin likely applies. However, TSBs may only affect vehicles with specific production dates, VIN ranges, or configurations. Your dealer can confirm by entering your VIN into their service system, which will show all applicable TSBs and recalls.

This data comes from the National Highway Traffic Safety Administration (NHTSA). Manufacturers are required to submit copies of all communications (including TSBs) sent to their dealers to NHTSA. The agency makes this data publicly available as part of its vehicle safety monitoring program.