Recall 14V137 covers 1,934 2010-2015 Mack Mru, Leu, and Pinnacle (Cxu) trucks for intake-manifold condensation that freezes. Free ECM calibration at authorized Cummins service facilities.
Mack is recalling 1,934 2010-2015 Mru, Leu, and Pinnacle (Cxu) trucks under recall 14V137 because condensation can freeze in the intake manifold and disrupt the pressure sensor. When that sensor operates improperly, exhaust temperatures or flames from the exhaust pipe can rise, which raises the risk of a vehicle fire or burn injury; the dealer repair will be free once available.
Does this recall apply to your specific vehicle?
The official, free per-VIN recall check is run by NHTSA. Enter your VIN and we'll forward you directly — and add you to a free watchlist so you hear about new recalls for your vehicle.
Check my VIN at NHTSARecallNotify doesn't check your VIN — NHTSA's official tool does. We use your email only to alert you to new recalls.
Watch this vehicle for recalls
Add it to your free watchlist and we will alert you as new federal recalls are posted for your year, make and model. New-recall alerts are rolling out now.
You are on the watchlist.
We will email you as new federal recalls are posted for your vehicle.
What's wrong?
The intake manifold on 2010-2015 Mack Mru, Leu, and Pinnacle (Cxu) trucks routes air into the engine. On trucks with certain Cummins Westport Model ISL G and ISX12 G engines, the intake manifold pressure sensor reads the air pressure in that manifold and sends that information to the engine controls. The engine uses that reading to manage fuel and airflow.
In cold weather, condensation inside the intake manifold can freeze. Ice in the manifold can interfere with the pressure sensor, so the engine controls receive a bad or blocked pressure reading. That is the defect in this recall: moisture turns into ice near a sensor that the engine depends on for normal operation.
There is no warning sign before failure. The recall filing does not list a specific noise, light, smell, or drivability symptom that reliably tells an owner the sensor is about to be affected.
Who's affected?
Spans the Mru, Leu, and Pinnacle (Cxu) lines across 2010-2015, all tied to the engine.
| 2011 Mack Mru | Engine |
|---|---|
| 2012 Mack Mru | Engine |
| 2013 Mack Mru | Engine |
| 2014 Mack Leu | Engine |
| 2014 Mack Mru | Engine |
| 2015 Mack Leu | Engine |
| 2015 Mack Mru | Engine |
| 2015 Mack Pinnacle (Cxu) | Engine |
| 2011 Mack Leu | Engine |
| 2014 Mack Pinnacle (Cxu) | Engine |
| 2013 Mack Leu | Engine |
| 2012 Mack Leu | Engine |
| 2010 Mack Leu | Engine |
| Units affected | 1,934 |
The year and model narrow the group, but the VIN decides. Check your VIN to confirm whether your specific truck is included.
What's the safety risk?
Improper sensor operation can raise exhaust temperatures or send flames from the exhaust pipe, increasing the risk of a vehicle fire or burn injury to someone standing nearby. Keep people clear of the exhaust area and schedule the ECM calibration repair soon. Repair will be free at any franchised Mack dealer once available.
What should I do?
- Check your VIN to confirm your 2010-2015 Mack Mru, Leu, or Pinnacle (Cxu) is included in this recall.
- Contact a franchised Mack dealer or authorized Cummins service facility and ask whether the free ECM calibration is open for your VIN.
- Reference recall number 14V137 and Mack recall SC0377 when you call.
- Schedule the free ECM calibration that fixes the intake-manifold pressure sensor problem tied to elevated exhaust temperatures or flames from the exhaust pipe.
- Keep people clear of the exhaust area until the repair is complete.
What happens at the repair
For recall 14V137, the known repair is an ECM calibration update for the Cummins Westport natural gas engine. A Mack service desk can route the truck to an authorized Cummins service facility, where the technician uploads the new engine control module calibration. That software update is intended to keep frozen intake-manifold condensation from interfering with the manifold pressure sensor. The dealer repair will be free once the repair path is open for your VIN. No separate reimbursement instructions are listed for this campaign.
Timeline
| March 12, 2014 | Owner notification mailed |
|---|---|
| March 24, 2014 | NHTSA published the recall |
Frequently asked questions
What is recall 14V137?
Recall 14V137 covers 1,934 2010-2015 Mack Mru, Leu, and Pinnacle (Cxu) vehicles with certain Cummins Westport natural-gas engines. Condensation in the intake manifold can freeze in cold weather and interfere with the intake manifold pressure sensor. The free repair is a new ECM calibration.
What should I do if my 2010-2015 Mack Mru, Leu, or Pinnacle (Cxu) is on this recall?
Check your VIN to confirm your specific truck is included in recall 14V137. If it is, contact Mack or an authorized Cummins service facility and ask for recall SC0377. The repair is a free ECM calibration update.
Is the recall repair free?
Yes. Federal recall law requires the manufacturer to fix the defect at no cost. For recall 14V137, authorized Cummins service facilities will upload a new ECM calibration free of charge, and Mack identifies this recall as SC0377.
What is the safety risk in recall 14V137?
The risk is elevated exhaust temperatures or flames from the exhaust pipe. NHTSA campaign 14V137 says improper intake manifold pressure sensor operation can increase the risk of a vehicle fire or burn injury to a person near the exhaust pipe.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/14V137000 |
|---|---|
| Mack customer service | 1-336-393-2000 |
| NHTSA recall # | 14V137 |
| NHTSA recall # (full) | 14V137000 |
Source documents
-
Download Recall Document (PDF) (PDF) - Download Quarterly Report (PDF)
- Download Defect / Noncompliance Notice (PDF) (PDF)
- Download Recall Acknowledgement (PDF)
This article is generated from NHTSA's primary recall filings and reviewed against the source on June 2, 2026. RecallNotify does not paraphrase NHTSA's consequence language; that text is reproduced as written above. Editorial standards →