TSB: MACK MACK (1994–2001)

Bulletin KC-252 — December 15, 2021

Bulletin Details

Bulletin IDKC-252
ManufacturerMACK
ModelsMACK
Model Years1994–2001
Date IssuedDecember 15, 2021
Date Added to NHTSAJanuary 5, 2022
ComponentEXTERIOR LIGHTING
Vehicles Affected21 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 - Daytime Running Lights ( DRL ) Module; Fault Code MID 144 PSID 40 Daytime Running Light Relay - Model Years Prior To 2018

Affected Vehicles

MakeModelYearComponent
MACK MACK 2001 121540 EXTERIOR LIGHTING:HEADLIGHTS:DAYTIME RUNNING LIGHTS:BULBS
MACK MACK 2001 121200 EXTERIOR LIGHTING:HEADLIGHTS:SWITCH
MACK MACK 2001 120000 EXTERIOR LIGHTING
MACK MACK 1999 121540 EXTERIOR LIGHTING:HEADLIGHTS:DAYTIME RUNNING LIGHTS:BULBS
MACK MACK 1999 121200 EXTERIOR LIGHTING:HEADLIGHTS:SWITCH
MACK MACK 1999 120000 EXTERIOR LIGHTING
MACK MACK 1998 121540 EXTERIOR LIGHTING:HEADLIGHTS:DAYTIME RUNNING LIGHTS:BULBS
MACK MACK 1998 121200 EXTERIOR LIGHTING:HEADLIGHTS:SWITCH
MACK MACK 1998 120000 EXTERIOR LIGHTING
MACK MACK 1997 121200 EXTERIOR LIGHTING:HEADLIGHTS:SWITCH
MACK MACK 1997 121540 EXTERIOR LIGHTING:HEADLIGHTS:DAYTIME RUNNING LIGHTS:BULBS
MACK MACK 1997 120000 EXTERIOR LIGHTING
MACK MACK 1996 121540 EXTERIOR LIGHTING:HEADLIGHTS:DAYTIME RUNNING LIGHTS:BULBS
MACK MACK 1996 121200 EXTERIOR LIGHTING:HEADLIGHTS:SWITCH
MACK MACK 1996 120000 EXTERIOR LIGHTING
MACK MACK 1995 121540 EXTERIOR LIGHTING:HEADLIGHTS:DAYTIME RUNNING LIGHTS:BULBS
MACK MACK 1995 121200 EXTERIOR LIGHTING:HEADLIGHTS:SWITCH
MACK MACK 1995 120000 EXTERIOR LIGHTING
MACK MACK 1994 120000 EXTERIOR LIGHTING
MACK MACK 1994 121540 EXTERIOR LIGHTING:HEADLIGHTS:DAYTIME RUNNING LIGHTS:BULBS
MACK MACK 1994 121200 EXTERIOR LIGHTING:HEADLIGHTS:SWITCH

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 (KC-252) 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.