Service bulletins for the 2026 Mercedes-Benz Sprinter
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.
7 on file from NHTSA, as of 2026-10-19.
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Only bulletins with component: Transmission and driveline are shown. Show all
| LI28_00-N-079097_1_en | 2026-09-04. Service bulletin. POWER TRAIN. Complaint While driving through muddy / sandy/ off road terrain "4Matic Currently Unavailable" message on the dash Cause This vehicle is not equipped with a fixed force distribution AWD, rather force is only applied to the front axle according to ESP calculations. As per GF28.00‑D‑ 9900A: "vehicles with 4MATIC all‑wheel system and variable force distribution, an electronically regulated multiplate clutch integrated into the transfer case provides for the torque distribution. If the multiplate clutch is open during normal driving operation, only the rear axle drives the vehicle. If the clutch is closed, the front axle comes into play." The message "All‑wheel drive temporarily unavailable" is not indicative of a malfunction but rather informs the driver that all‑wheel drive is currently not available due to the transfer case clutch overheating. This occurs when the vehicle is driven in such a way that maximum front axle torque is needed for an extended period, causing the clutch to get excessively hot. If the vehicle is being driven under heavy load conditions, like in deep sand or snow, the rear axle may slip while the front axle does not deliver power. The transfer case then attempts to distribute torque to correct the slip, but it is limited to a maximum of 1150 Nm to protect the front axle transmission. In extended heavy‑load scenarios, the multidisk clutch in the transfer case slips, increasing the temperature. If the temperature model detects a critical temperature of 240°C, the system protects itself by disconnecting until it cools down to around 160°C, after which the all‑wheel drive becomes available again and the warning message disappears.Vehicles can handle flat terrain easily, but steep slopes or situations where wheels slip might cause additional resistance, leading to the described protection events and message in the dash. Remedy Recommendation is to release the vehicle back to the client with an explanation that the vehicle is operating as designed. Please advise the client to limit vehicle acceleration in limited traction situations to avoid disabling of the 4Matic system ‑ please see "Notes on all‑wheel drive" provided in the operators manual. |
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| LI18_40-N-080867_1_en | 2026-09-03. Service bulletin. POWER TRAIN. OM654 Engine Oil Consumption Complaint The customer may report repeated low engine oil level warnings in the instrument cluster. The customer may also state that engine oil must be added between scheduled maintenance intervals. During diagnosis, oil residue may be observed at the oil filler neck, cylinder head cover, crankcase ventilation connection, charge air pipes, charge air cooler, intake tract, or turbocharger area. In some cases, the complaint may be accompanied by increased diesel particulate filter (DPF) regeneration frequency or aftertreatment‑related fault entries. Cause Increased engine oil consumption may be caused by external oil leakage, crankcase ventilation system concerns, reduced oil separation efficiency in the cylinder head cover, turbocharger oil leakage, charge air system oil accumulation, fuel dilution, vehicle operating profile, oil level sensor plausibility concerns, or internal engine mechanical damage. A measured engine oil consumption test is required before a repair direction is determined. Customer‑reported oil additions or instrument cluster oil level messages alone are not sufficient to determine the repair. Remedy 1. Perform the engine oil consumption measurement according to AR18.00‑D‑ 0025TSM. 2. If the measured oil consumption is within specification, no repair related to engine oil consumption is required. • Verify the correct engine oil specification and review the vehicle operating profile, maintenance history, idle time, and regeneration frequency. If the complaint is based mainly on an oil level message and measured oil consumption is not confirmed, verify oil level sensor plausibility before continuing with engine oil consumption diagnosis. 3. If the measured oil consumption exceeds specification, inspect the engine for external oil leaks. • Pay close attention to the oil filler neck, oil filler neck seal, cylinder head cover area, oil filter housing, crankcase ventilation connections, turbocharger oil supply and return areas, and other visible sealing points. 4. If an external oil leak is identified, repair the leak according to the applicable repair instructions. • Correct the engine oil level and repeat the oil consumption measurement if necessary. 5. Inspect the crankcase ventilation connection, turbocharger inlet and outlet, charge air pipes, and charge air cooler for oil accumulation. • A light oil film alone does not confirm a turbocharger or engine failure. Oil pooling, heavy oil accumulation, debris, or oil migration into the intake tract requires further inspection. 6. If there is no clear external oil leak, no severe charge air system oil contamination, and no obvious turbocharger damage, inspect the crankcase ventilation system first. 7. Perform the crankcase ventilation shutoff valve leak‑tightness test according to AR01.40‑D‑0050TSM. 8. If the crankcase ventilation shutoff valve fails the leak‑tightness test, replace the shutoff valve and the cylinder head cover with integrated oil separator. Replace all required seals and hardware. 9. If the crankcase ventilation shutoff valve passes the leak‑tightness test, no external oil leak is identified, no abnormal turbocharger oil entry is found, and the engine mechanical condition is not suspect, replace the cylinder head cover with integrated oil separator. • Fill the engine with oil meeting MB 229.52 SAE 5W‑30 and repeat the engine oil consumption measurement according to AR18.00‑D‑0025TSM. |
| LI20_10-N-080868_1_en | 2026-09-03. Service bulletin. POWER TRAIN. Complaint The coolant warning lamp may be displayed in the instrument cluster. The malfunction indicator lamp (MIL) may also be illuminated. Cause Moisture or corrosion may be present in the connector of the low‑temperature circuit switchover valve (Y97/6) or coolant pump 1 (M75/11). Remedy Inspect the connectors and pins at the low‑temperature circuit switchover valve and coolant pump 1 for moisture, corrosion, or terminal damage. If moisture, corrosion, or terminal damage is found, replace the affected connector or wiring harness and the corresponding component as required. If available, use the wiring harness as the repair measure. If the wiring harness is not available or is not applicable, replace the connector housing and required small parts in the wiring harness. |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.