Service bulletins for the 2021 Freightliner 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.
87 on file from NHTSA, as of 2026-10-19.
About P2556 on the 2021 Freightliner Sprinter: what the code means, and the bulletins and recalls about the same components.
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Only bulletins with trouble code: P2556 are shown. Show all
| LI09.41-N-079165_1 | 2025-05-02. Service bulletin. ENGINE. Low Coolant Warning, Potential Misfire, and Absence of External Coolant Leaks Complaint Low Coolant warning with possible engine misfire caused by a leaking Charge Air Cooler (Intercooler), accompanied by one or more of the following possible fault codes related to the coolant system: P30040B: Component 'Temperature sensor downstream of charge air cooler' has an open circuit or short circuit to po- sitive. P25567B: Sensor 'Coolant level' has a malfunction. The fluid level is too low. Cause The potential causes for this topic are: A. A leak in the Coolant System, other than the Charge Air Cooler. B. An Internal leak of the Charge Air Cooler. C. An unapproved/aftermarket upfit or modification to the coolant system. Remedy A. A leak in the Coolant System, other than the Charge Air Cooler 1. Complete a coolant system pressure test: •Refer to WIS Doc AR20.00-D-1011TS - Check engine cooling system for leak tightness. •Use Tester Cap 210 589 00 91 and Pressure Pump 124 589 24 21 00. •Apply test pressure to the engine cooling system. Do not exceed the specified test pressure of 1.5 Bar to prevent da- mage to the engine cooling system. •Perform a visual check on the top and bottom of the engine compartment and in the vehicle interior. •If coolant loss or pressure loss is present, perform suitable repair measures depending on the vehicle equipment. •If NO signs of coolant loss are found but pressure loss is present, proceed to Step B. |
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The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.